[ncl-talk] help reg plotting point data

[Geeta Geeta]

dear all. I am handling orbital data. KIndly see the image. This image contains the lighening flashes. The points where the flashes have been detected are in the columns 3 and 4. these points are not at regular intervals. 
2009-135T17:16:02.89Z  [May 15]  12.803  80.294  3727791  637  75  3232009-135T17:16:03.13Z  [May 15]  11.900  80.889  1878094  295  16  1762009-135T17:16:03.57Z  [May 15]  11.855  80.712  214268  343  8  352009-135T17:16:03.57Z  [May 15]  11.798  80.942  4870  0  1  12009-135T17:16:03.61Z  [May 15]  14.272  77.793  25061  92  4  52009-135T17:16:03.69Z  [May 15]  14.275  77.644  17246  14  2  32009-135T17:16:03.92Z  [May 15]  11.678  81.018  502901  293  16  662009-135T17:16:04.06Z  [May 15]  12.752  80.407  224489  306  10  332009-135T17:16:04.19Z  [May 15]  12.517  80.345  815693  610  17  802009-135T17:16:05.50Z  [May 15]  11.763  80.945  123952  232  9  152009-135T17:16:05.53Z  [May 15]  14.275  77.532  15155  0  1  22009-135T17:16:05.56Z  [May 15]  11.753  80.734  18808  62  3  42009-135T17:16:05.65Z  [May 15]  11.961  80.783  41066  161  2  62009-135T17:16:06.38Z  [May 15]  12.514  80.392  1418501  370  35  1212009-135T17:16:06.68Z  [May 15]  11.471  81.077  57752  39  5  82009-135T17:16:06.75Z  [May 15]  11.824  80.940  75117  136  2  102009-135T17:16:07.09Z  [May 15]  11.896  80.774  27824  182  3  52009-135T17:16:07.10Z  [May 15]  11.616  81.059  26419  0  1  42009-135T17:16:07.20Z  [May 15]  11.960  80.743  292843  286  9  472009-135T17:16:07.87Z  [May 15]  11.711  80.996  34763  224  6  62009-135T17:16:09.50Z  [May 15]  11.876  80.760  1270442  495  16  1132009-135T17:16:09.62Z  [May 15]  11.645  81.078  229360  173  7  302009-135T17:16:09.79Z  [May 15]  12.764  80.422  161536  275  11  312009-135T17:16:10.39Z  [May 15]  11.664  80.982  57013  220  2  102009-135T17:16:10.53Z  [May 15]  11.632  81.006  213758  162  7  282009-135T17:16:11.25Z  [May 15]  12.944  80.153  1261461  546  49  1622009-135T17:16:11.63Z  [May 15]  12.930  80.257  28505  16  2  52009-135T17:16:11.77Z  [May 15]  12.513  80.298  46628  57  3  92009-135T17:16:11.79Z  [May 15]  12.818  80.091  276188  639  13  542009-135T17:16:12.07Z  [May 15]  11.976  80.770  47943  73  4  62009-135T17:16:12.90Z  [May 15]  12.532  80.362  481182  495  15  542009-135T17:16:12.95Z  [May 15]  11.415  81.085  107851  320  8  192009-135T17:16:13.31Z  [May 15]  11.769  80.697  19479  67  2  4 suppose there are 10 lines like this, then there are 10 lighening flashes. 
I want to know how I should generate the figure like the one attached. i would be grateful if someone can suggest the logic. 
thanks
Geeta.
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