<tr><td class="paramname">clat</td><td>array of nst-inst+1 elemets of latitudes </td></tr>
    <tr><td class="paramname">clon</td><td>array of nst-inst+1 elemets of longitudes </td></tr>
    <tr><td class="paramname">inst</td><td>start value of clat and clon arrays </td></tr>
    <tr><td class="paramname">nst</td><td>end value of clat and clon arrays </td></tr>
    <tr><td class="paramname">ist</td><td>column index value </td></tr>
    <tr><td class="paramname">jst</td><td>row index value </td></tr>
  </tab