[ncl-talk] grid_area_avg

Kunal Bali kunal.bali9 at gmail.com
Tue Oct 24 23:59:13 MDT 2017


It also shows an error if I replaced := with = in 38 line of the given
script (attached earlier), even though variable is in 2D array.

fatal:["Execute.c":7950]:Number of subscripts on right-hand-side do not
match
            number of dimensions of variable: (2), Subscripts used: (3)

fatal:["Execute.c":8640]:Execute: Error occurred at or near line 38 in file
extract1.ncl



Kunal Bali







On Tue, Oct 24, 2017 at 4:46 PM, Helen Macintyre <Helen.Macintyre at phe.gov.uk
> wrote:

> You are trying to delete a variable that has not been assigned.
>
>
>
> Using “:=” tries to delete aot_subset when it doesn’t exist yet.
>
>
>
> More info here:
>
> http://www.ncl.ucar.edu/Document/Language/varb_assign.shtml
>
>
>
>
>
>
>
> *From:* ncl-talk [mailto:ncl-talk-bounces at ucar.edu] *On Behalf Of *Kunal
> Bali
> *Sent:* 24 October 2017 06:28
> *To:* ncl-talk at ucar.edu
> *Subject:* Re: [ncl-talk] grid_area_avg
>
>
>
> I am not able to sort out the query regarding
>
> fatal:Variable (aot_subset) is undefined
> fatal:["Execute.c":8640]:Execute: Error occurred at or near line 38 in
> file extract1.ncl
>
> I have attached my script. please let me know how to solve it (the file
> regarding this script is attached in the previous mail).
>
>
>
> sorry for the inconvenience*. *
>
>
>
>
>
> regards
>
> Kunal Bali
>
>
>
>
>
>
>
>
>
> On Sat, Oct 21, 2017 at 1:53 PM, Kunal Bali <kunal.bali9 at gmail.com> wrote:
>
> thanks for providing this information. I am positive that the given
> variable in the data is a 2D array and the error is coming on 38 line as I
> mentioned earlier.
>
> I am trying to debug this problem accordingly as you mentioned.
>
> However, I have attached the data (size =30mb, tried via ftp but facing
> some error while uploading) and the full script for extracting the grid box
> mean value.
>
>
>
> Thank You for all the support.
>
>>
> * maiactaot.h00v02.20010040635-20011550640.nc.bz2
> <https://drive.google.com/file/d/0B6MS-JLMHECwaVh3QVVHUU1Wazg/view?usp=drive_web>*
>
>>
>
> Kunal Bali
>
>
>
>
>
>
>
>
>
>
>
> On Fri, Oct 20, 2017 at 9:14 PM, Mary Haley <haley at ucar.edu> wrote:
>
> Kunal,
>
>
>
> Multiple people have tried to help you, but you continue to post error
> messages without trying to debug them yourself. If you don't make an
> effort, people are likely to stop trying to help. You are including code
> snippets, but this is not always enough for us to help you debug the
> problem. You need to include full scripts, output from
> print/printVarSummary commands, AND all error messages.
>
>
>
> For example, you originally included this code:
>
>
>
>   latv = (/ 18, 24/)     ; for extracting grid box data
>
>   lonv = (/ 74, 78 /)
>
>   nm   = getind_latlon2d (lat2d, lon2d, latv, lonv)
>
>   ilt1 = nm(0,0)  ; start lat index
>
>   ilt2 = nm(1,0)  ; start lon index
>
>   iln1 = nm(0,1)  ; end lat index
>
>   iln2 = nm(1,1)  ; end lon index
>
>   lat_subset  := lat2d(ilt1:ilt2,iln1:iln2)
>
>   lon_subset := lon2d(ilt1:ilt2,iln1:iln2)
>
>   aot_subset := data
>
>   aot_subset(ilt1:ilt2,iln1:iln2) := data(ilt1:ilt2, iln1:iln2)
>
>
>
>   ;printVarSummary(aot_subset)
>
>   aot_avg = avg(data)
>
>   aot_subset_avg = avg(aot_subset)
>
>
>
> and then said that you were getting an error about aot_subset being
> undefined. From the perspective of somebody who is just looking at the code
> snippet above and doesn't have access to your full script, we are going to
> wonder about this line:
>
>
>
>   aot_subset := data
>
>
>
> Since this appears to be the first time aot_subset is set, our next
> question is going to be "is data defined"? In the code snippet you
> included, we don't see where "data" is defined, so we have no way to help.
> This is where a "printVarSummary(data)" line would have helped.
>
>
>
> In your last email, in which you did include some information about
> "data", things are still not making any sense. You said you were subsetting
> data as a 2D array with:
>
>
>
> aot_subset(ilt1:ilt2,iln1:iln2) = data(ilt1:ilt2,iln1:iln2)
>
>
>
> which you said was causing this error:
>
>
>
> fatal:["Execute.c":7950]:Number of subscripts on right-hand-side do not
> match
>
>             number of dimensions of variable: (2), Subscripts used: (3)
>
>
>
> This error doesn't seem possible, because it's saying that you are using 3
> subscripts, but the line only has 2 subscripts being used in both arrays.
> Are you positive that this error is coming from this line?
>
>
>
> I have to ask you again to please include your *full script* next time
> and *all error messages* and *all printed output*, so people can see
> exactly what line numbers in your script the errors correspond with and
> what your data looks like. But don't do this until you have shown that you
> tried to debug the problem yourself. Use "print" and "printVarSummary"
> *before* the locations where the error messages are occurring, so you can
> see what might be causing the error.
>
>
>
> For example, if the error says
>
>
>
>  number of dimensions of variable: (2), Subscripts used: (3)
>
>
>
> then this means you are subscripting a variable as if it were a 2D array,
> when it is actually a 3D array. Add *printVarSummary* statements on ALL
> subscripted variables that occur in that line, so you can be sure you are
> doing things correctly.  For example, if the error occurs on this line:
>
>
>
>   aot_subset(ilt1:ilt2,iln1:iln2) := data(ilt1:ilt2, iln1:iln2)
>
>
>
> then do this:
>
>
>   printVarSummary(data)
>
>   printVarSummary(aot_subset)
>
>   aot_subset(ilt1:ilt2,iln1:iln2) := data(ilt1:ilt2, iln1:iln2)
>
>
>
> It may also help to print the il* variables:
>
>
>
>   printVarSummary(data)
>
>   printVarSummary(aot_subset)
>
>   print("ilt1 = " + ilt1)
>
>   print("ilt2 = " + ilt2)
>
>   print("iln1 = " + iln1)
>
>   print("iln2 = " + iln2)
>
>   aot_subset(ilt1:ilt2,iln1:iln2) := data(ilt1:ilt2, iln1:iln2)
>
>
>
>
>
> Moving forward, you *must* show that you are making some effort to debug
> your problem.
>
>
>
> Thank you for your consideration.
>
>
>
> --Mary
>
>
>
>
>
>
>
> On Wed, Oct 18, 2017 at 12:23 AM, Kunal Bali <kunal.bali9 at gmail.com>
> wrote:
>
> printVarSummary(aot_subset), shows that aot_subset is undefined, which I
> am unable to fix this problem yet.
>
> If I used aot_subset(ilt1:ilt2,iln1:iln2) *=* data(ilt1:ilt2,iln1:iln2) *instead
> of *aot_subset(ilt1:ilt2,iln1:iln2) *:=* data(ilt1:ilt2,iln1:iln2)
>
>
> then the error appeared as
>
>
> *fatal:["Execute.c":7950]:Number of subscripts on right-hand-side do not
> match             number of dimensions of variable: (2), Subscripts used:
> (3)*
>
> basically, the data summary is
>
> Variable: fnames
> Type: string
> Total Size: 8 bytes
>             1 values
> Number of Dimensions: 1
> Dimensions and sizes:    [1]
> Coordinates:
> (0)    ./maiactaotE.h00v03.20000550525-20003660700.nc
>
> Variable: data
> Type: float
> Total Size: 2545920000 <(254)%20592-0000> bytes
>             636480000 values
> Number of Dimensions: 3
> Dimensions and sizes:    *[time | 442] x [YDim_grid1km | 1200] x
> [XDim_grid1km | 1200]*
> Coordinates:
>             time: [1301.416666666686..8767]
> Number Of Attributes: 8
>   coordinates :    GridLat_grid1km, GridLon_grid1km
>   hdfeos_name :    Optical_Depth_055
>   projection :    Albers Conical Equal_Area
>   unit :    None
>   long_name :    AOT at 0.55 micron
>   _FillValue_original :    -28672
>   _FillValue :    -28672
>   valid_range :    ( -0.1,  5 )
> (0)    latitude (degrees_north) : min=11.2940312768897
> max=24.54921980985786
> (0)    longitude (degrees_east) : min=68.08003670367275
> max=81.63171349927691
>
> *fatal:["Execute.c":7776]:aot_subset is undefined, can not subscript an
> undefined variable fatal:["Execute.c":8640]:Execute: Error occurred at or
> near line 38 in file test_extract.ncl*
>
> *38 line is *
> *aot_subset(ilt1:ilt2,iln1:iln2) = data(ilt1:ilt2,iln1:iln2)*
>
> *fatal:Variable (aot_subset) is undefined*
>
>
>
>
>
>
>
>
>
>
>
>
>
> regards
>
> Kunal Bali
>
>
>
>
>
>
>
>
>
>
>
> On Tue, Oct 17, 2017 at 3:05 PM, Guido Cioni <guidocioni at gmail.com> wrote:
>
> Why did you comment this line ?
>
>
>
>   ;printVarSummary(aot_subset)
>
>
>
> That would have helped you in debugging the error on your own.
>
>
>
> You are using the re-assignment operator ":=". This means that every time
> you make an assignment the variable is created again. Thus, you cannot make
> this assignment
>
>
>
>  * aot_subset(ilt1:ilt2,iln1:iln2) := data(ilt1:ilt2, iln1:iln2)*
>
>
>
> as NCL has no way to know the shape of aot_subset beforehand.
>
>
>
> The following should be used instead (notice the assignment with "=" in
> the second line).
>
>
>
>   aot_subset := data
>
>   aot_subset = aot_subset at _FillValue
>   aot_subset(ilt1:ilt2,iln1:iln2) *=* data(ilt1:ilt2, iln1:iln2)
>
>
>
> Notice that this will (1) create an array which is shaped like data (2)
> fill it with fill values as you only want to compute the average over the
> subset (3) populate the array only in the lat-lon box provided. However I
> don't see why you would want to use such a complicated syntax when the
> following code would produce the same result
>
>
>
> aot_subset_avg=avg(data(ilt1:ilt2, iln1:iln2))
>
>
>
> If you have the right coordinate attributes you can even jump the first 7
> lines and do
>
>
>
> aot_subset_avg=avg(data({18:24},{74:78})
>
>
>
> but I don't know your data.
>
>
>
> As it was already suggested by Mary and others, PLEASE take time to debug
> the errors on your own.
>
>
>
> Regards,
>
>
>
> On 17. Oct 2017, at 11:25, Kunal Bali <kunal.bali9 at gmail.com> wrote:
>
>
>
>
>
> I did the following changes but still getting an error of * aot_subset*
> which is undefined.
>
> please let me know that how to fix or defined the *aot_subset *this
> problem.
>
>
>
>
>   latv = (/ 18, 24/)     ; for extracting grid box data
>   lonv = (/ 74, 78 /)
>   nm   = getind_latlon2d (lat2d, lon2d, latv, lonv)
>   ilt1 = nm(0,0)  ; start lat index
>   ilt2 = nm(1,0)  ; start lon index
>   iln1 = nm(0,1)  ; end lat index
>   iln2 = nm(1,1)  ; end lon index
>   lat_subset  := lat2d(ilt1:ilt2,iln1:iln2)
>   lon_subset := lon2d(ilt1:ilt2,iln1:iln2)
>   aot_subset := data
>  * aot_subset(ilt1:ilt2,iln1:iln2) := data(ilt1:ilt2, iln1:iln2)*
>
>   ;printVarSummary(aot_subset)
>   aot_avg = avg(data)
>   aot_subset_avg = avg(*aot_subset*)
>
>   ;print(nm)
>   print("-----")
>
>   do k=0,dimsizes(latv)-1
>      n = nm(k,0)
>      m = nm(k,1)
>      print(lat2d(n,m)+"   "+lon2d(n,m))
>      print("     "+data(:,n,m))                   ; nearest grid point at
> all time steps
>      print("-----")
>   end do
>
>
>
>
> regards
>
> Kunal Bali
>
>
>
>
>
>
>
>
>
>
>
>
>
> On Tue, Oct 17, 2017 at 12:41 PM, Kunal Bali <kunal.bali9 at gmail.com>
> wrote:
>
> I have sent the ncl script and data to the incoming dir with the given
> names as
>
> data = maiactaotE.h00v03.20003660525-20003660700.nc.bz2
>
> ncl_script = extract_iiserb.ncl
>
>
>
> I am not able to define the var_subset in the given script.
>
> please let me know if you have received the data and script?
>
>
>
>
> Kunal Bali
>
>
>
>
>
>
>
>
>
>
>
>
>
> On Mon, Oct 16, 2017 at 11:07 PM, Mary Haley <haley at ucar.edu> wrote:
>
> Kunal,
>
>
>
> You must make an effort to debug some of these problems on your own. The
> error is telling you that something is wrong around line 34 and it is
> telling you exactly what the problem is. Please try to fix this error.
>
>
>
> If you continue to have problems after fixing this error, then I need to
> ask you to provide the full script and data via ftp:
>
>
>
> http://www.ncl.ucar.edu/ftp_files.shtml
>
>
>
> However, make sure you debug any other new problems that come up, instead
> of just emailing them to ncl-talk.  We have a page to help you understand
> some of NCL's errors, and what causes them:
>
>
>
> http://www.ncl.ucar.edu/Document/Language/error_messages.shtml
>
>
>
> The particular error you're seeing can be found here:
>
>
>
> http://www.ncl.ucar.edu/Document/Language/error_messages.shtml#NumSubRHS
>
>
>
> As a side note, you are running a 3-year old version of NCL. I suggest
> that you upgrade to NCL V6.4.0.
>
>
>
> --Mary
>
>
>
>
>
>
>
> On Mon, Oct 16, 2017 at 12:52 AM, Kunal Bali <kunal.bali9 at gmail.com>
> wrote:
>
> I simply include the code (which you mentioned) were I was taking the avg
> of the data as given below (please correct me if I did wrong)
>
>
> ;----------------------------------------------------------------------
> ; Main code
> ;----------------------------------------------------------------------
>   dir    = "./"
>   fnames = systemfunc("ls " + dir + "maiactaot*.nc")
> print(fnames)
>   a      = addfile(fnames,"r")
>   data   = short2flt(a->Optical_Depth_055_grid1km)
> printVarSummary (data)
> printMinMax (data, 0)
> print("-----")
>   nFill  = num(ismissing(data))
> print("nFill="+nFill)
> print("-----")
>
>   lat2d  = a->GridLat_grid1km
>   lon2d  = a->GridLon_grid1km
> printMinMax (lat2d, 0)
> printMinMax (lon2d, 0)
> print("-----")
>
> ;---grid points of interest
> ;---http://www.ncl.ucar.edu/Document/Functions/
> Contributed/getind_latlon2d.shtml
>  ; latv = (/22, 24.0, 24.0, 22.0, 22.0/)
>  ; lonv = (/76, 76.0, 78.0, 78.0, 76.0/)
>
>
>
>
>
>
>
>
>
> *latv = (/ 22, 24/)   lonv = (/ 76, 78 /)   nm   = getind_latlon2d (lat2d,
> lon2d, latv, lonv)   ilt1 = nm(0,0)  ; start lat index   ilt2 = nm(1,0)  ;
> start lon index   iln1 = nm(0,1)  ; end lat index   iln2 = nm(1,1)  ; end
> lon index   var_subset = var(ilt1:ilt2,iln1:iln2)   var_subset_avg =
> avg(var_subset)*
>
>   print(nm)
>   print("-----")
>
>   do k=0,dimsizes(latv)-1
>      n = nm(k,0)
>      m = nm(k,1)
>      print(lat2d(n,m)+"   "+lon2d(n,m))
>      print("     "+data(:,n,m))                   ; nearest grid point at
> all time steps
>      print("-----")
>   end do
>
>
>
>
> *But still not getting the desired output as a single square box mean
> value . It is showing the errors as*
>
> kunal at kunal-Vostro-1015:/media/Local Disk_/IIT_DELHI/2001/MAIACTAOT_TIME$
> ncl extract1.ncl
>  Copyright (C) 1995-2014 - All Rights Reserved
>  University Corporation for Atmospheric Research
>  NCAR Command Language Version 6.2.1
>  The use of this software is governed by a License Agreement.
>  See http://www.ncl.ucar.edu/ for more details.
>
>
> Variable: fnames
> Type: string
> Total Size: 4 bytes
>             1 values
> Number of Dimensions: 1
> Dimensions and sizes:    [1]
> Coordinates:
> (0)    ./maiactaot.h00v02.20010040635-20011550640.nc
>
> Variable: data
> Type: float
> Total Size: 40320000 bytes
>             10080000 values
> Number of Dimensions: 3
> Dimensions and sizes:    [time | 7] x [YDim_grid1km | 1200] x
> [XDim_grid1km | 1200]
> Coordinates:
>             time: [8862.583333333314..12486.66666666669]
> Number Of Attributes: 8
>   coordinates :    GridLat_grid1km, GridLon_grid1km
>   hdfeos_name :    Optical_Depth_055
>   projection :    Albers Conical Equal_Area
>   unit :    None
>   long_name :    AOT at 0.55 micron
>   _FillValue_original :    -28672
>   _FillValue :    -28672
>   valid_range :    ( -0.1,  5 )
> (0)    AOT at 0.55 micron: min=0   max=3.924
> (0)    -----
> (0)    nFill=6285271
> (0)    -----
> (0)    latitude: min=21.86737357453027   max=34.99855492029426
> (0)    longitude: min=64.23634233372005   max=79.4747290253718
> (0)    -----
> fatal:["Execute.c":7863]:Number of subscripts on right-hand-side do not
> match
>             number of dimensions of variable: (2), Subscripts used: (3)
>
> fatal:["Execute.c":8578]:Execute: Error occurred at or near line 34 in
> file extract1.ncl
>
> fatal:Variable (var_subset) is undefined
> fatal:["Execute.c":8578]:Execute: Error occurred at or near line 35 in
> file extract1.ncl
>
>
>
>
> Variable: nm
> Type: integer
> Total Size: 16 bytes
>             4 values
> Number of Dimensions: 2
> Dimensions and sizes:    [2] x [2]
> Coordinates:
> Number Of Attributes: 1
>   long_name :    indices closest to specified LAT/LON coordinate pairs
> (0,0)    1199
> (0,1)    792
> (1,0)    1199
> (1,1)    1041
> (0)    -----
> (0)    23.76603307545667   75.53995171540016
> (0)         0.179
> (1)         0.142
> (2)         -28672
> (3)         0.169
> (4)         -28672
> (5)         -28672
> (6)         -28672
> (0)    -----
> (0)    24.26559325846936   77.93996773594735
> (0)         -28672
> (1)         0.393
> (2)         -28672
> (3)         0.156
> (4)         0.313
> (5)         -28672
> (6)         -28672
> (0)    -----
>
>
>
>
>
>
>
>
>
>
> Kunal Bali
>
>
>
>
>
>
>
>
>
>
>
> On Sat, Oct 14, 2017 at 12:24 AM, Mary Haley <haley at ucar.edu> wrote:
>
> Kunal,
>
>
>
> Please include the code where you are actually taking the average of your
> data using the information returned from getind_latlon2d.
>
>
>
> It's important to note that getind_latlon2d simply returns the individual
> index values that are closest to each of the lat/lon pairs that you gave
> it. It doesn't work in such a way that you give it a lat/lon box and it
> returns all the values in that box.
>
>
>
> That's what I was trying to illustrate with the wrf_gsn_10.ncl I created.
> I gave the function two corners of the box, and then using the two pairs of
> index values I got back, I was able to get all the values inside the box
> area of interest:
>
>
>
>   lats = (/ min_lat, max_lat /)
>
>   lons = (/ min_lon, max_lon /)
>
>   nm   = getind_latlon2d (lat2d, lon2d, lats, lons)
>
>   ilt1 = nm(0,0)  ; start lat index
>
>   ilt2 = nm(1,0)  ; start lon index
>
>   iln1 = nm(0,1)  ; end lat index
>
>   iln2 = nm(1,1)  ; end lon index
>   var_subset = var(ilt1:ilt2,iln1:iln2)
>
>   var_subset_avg = avg(var_subset)
>
>
>
> --Mary
>
>
>
>
>
> On Thu, Oct 12, 2017 at 1:19 PM, Kunal Bali <kunal.bali9 at gmail.com> wrote:
>
> Dear Haley Ma'am,
>
>
>
> Thanks for providing the information and example.
>
> But if I follow the getind_latlon2d function as I did, then it seems like
> I followed the same procedure as given in the example
> http://www.ncl.ucar.edu/Document/Functions/Contributed/getind_latlon2d.
> shtml
>
>
>
> But still I am not getting the mean of the grid box on every time step or
> am I reading incorrectly the result ?
>
>
>
>
>
> regards
>
> Kunal Bali
>
>
>
>
>
>
>
>
>
>
>
>
>
> On Fri, Oct 13, 2017 at 12:11 AM, Mary Haley <haley at ucar.edu> wrote:
>
> Kunal,
>
>
>
> I created an example for you, showing three ways you can subset a WRF grid
> (since I already had a similar example).  It shows how to use the
> getind_latlon2d function.
>
>
>
> You have to be careful with subsetting curvilinear data, because
> specifying a lat/lon box to take an average over can mean two different
> things. You will be able to see the difference when you look at the graphic.
>
>
>
> See example wrf_gsn_10.ncl at:
>
>
>
> http://www.ncl.ucar.edu/Applications/wrfgsn.shtml#ex10
>
>
>
> --Mary
>
>
>
>
>
>
>
> On Wed, Oct 11, 2017 at 12:03 PM, Kunal Bali <kunal.bali9 at gmail.com>
> wrote:
>
> Dear NCL users,
>
>
> Single point coordinates values of 23.0 N and 77.0 E is extracted or print
> by using the script below
>
> ----------------------------------------------------------------------
> ; Main code
> ;----------------------------------------------------------------------
>   dir    = "./"
>   fnames = systemfunc("ls " + dir + "maiactaot*.nc")
> print(fnames)
>   a      = addfile(fnames,"r")
>   data   = short2flt(a->Optical_Depth_055_grid1km)
>   nFill  = num(ismissing(data))
>   lat2d  = a->GridLat_grid1km
>   lon2d  = a->GridLon_grid1km
>
> ;---grid points of interest
>   latv = (/23.0/)
>   lonv = (/77.0 /)
>
>   nm = getind_latlon2d (lat2d,lon2d, latv, lonv)
>
>   do k=0,dimsizes(latv)-1
>      n = nm(k,0)
>      m = nm(k,1)
>      print(lat2d(n,m)+"   "+lon2d(n,m))   ; grid point location
>      print("     "+data(:,n,m))                   ; nearest grid point at
> all time steps
>      print("-----")
>   end do
>
>
> NOW, I want to extract the square grid box of 100 km around the
> coordinates (23N,77E) such as
>    latv = (/22, 24.0, 24.0, 22.0, 22.0/)
>    lonv = (/76, 76.0, 78.0, 78.0, 76.0 /)
>
>
> after that I want to do the area mean of the grid box. So that I can get
> one single point value of that grid box.
>
> So when I replacing
>   latv = (/23.0/)
>   lonv = (/77.0/)
>
>
>
> with
>
>    latv = (/22, 24.0, 24.0, 22.0, 22.0/)
>    lonv = (/76, 76.0, 78.0, 78.0, 76.0 /)
>
> then It's not giving mean of the square grid box.
>
> It shows the something like that (given below), which is incorrect. So
> please let me know how can I get the square grid box mean and then extract
> as asciiwrite or print?
>
> (0)    23.76603307545667   75.53995171540016
> (0)         0.179
> (1)         0.142
> (2)         -28672
> (3)         0.169
> (4)         -28672
> (5)         -28672
> (6)         -28672
> (0)    -----
> (0)    24.00322458681621   75.99551564353467
> (0)         0.171
> (1)         0.16
> (2)         -28672
> (3)         0.17
> (4)         -28672
> (5)         -28672
> (6)         -28672
>
> etc..etc..
>
>
>
> regards
>
> Kunal Bali
>
>
>
>
>
>
>
>
>
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>
> Guido Cioni
>
> http://guidocioni.altervista.org
>
>
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>
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