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    <div class="moz-cite-prefix">Thanks Rick,</div>
    <div class="moz-cite-prefix"><br>
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    <div class="moz-cite-prefix">It works.</div>
    <div class="moz-cite-prefix"><br>
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    <div class="moz-cite-prefix">LSL<br>
    </div>
    <div class="moz-cite-prefix"><br>
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    <div class="moz-cite-prefix">On 2021/9/8 下午10:49, Rick Brownrigg
      wrote:<br>
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cite="mid:CAGKRhbG6xFHK8TT5-YJ8+uwu8Sve8prq3EMZOcBENetn_ueCUw@mail.gmail.com">
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        <div>Hi,</div>
        <div><br>
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        <div>I don't know for certain, but you might try making your
          variable "loess_id", which is assigned from the call to
          gsn_add_shapefile_polylines(), into an array of type graphic
          and len=4, just like you do with the variables plot and map.</div>
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        <div>Hope that helps...</div>
        <div>Rick</div>
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      <div class="gmail_quote">
        <div dir="ltr" class="gmail_attr">On Wed, Sep 8, 2021 at 8:22 AM
          LSL via ncl-talk <<a
            href="mailto:ncl-talk@mailman.ucar.edu"
            moz-do-not-send="true">ncl-talk@mailman.ucar.edu</a>>
          wrote:<br>
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          0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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            <p> </p>
            <p style="margin-bottom:0in;line-height:100%">Dear NCL
              community,</p>
            <p style="margin-bottom:0in;line-height:100%"><br>
            </p>
            <p style="margin-bottom:0in;line-height:100%">I have met a
              problem when overlaying polyline boundary on each contour
              plots within one panel. It seems that whatever how many 
              sentences with gsn_add_shapefile_polylines added, there is
              always one boundary on one plot. <br>
            </p>
            <p style="margin-bottom:0in;line-height:100%"><br>
            </p>
            <p style="margin-bottom:0in;line-height:100%">How can I add
              for all four plots? Thanks in advance, </p>
            <p style="margin-bottom:0in;line-height:100%"><br>
            </p>
            <p style="margin-bottom:0in;line-height:100%">LSL</p>
            <p style="margin-bottom:0in;line-height:100%"><br>
            </p>
            <p style="margin-bottom:0in;line-height:100%">The script and
              figure is attached.</p>
            <p> </p>
          </div>
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