[ferret_users] fill between the line

[jagadish karmacharya <j_karmacharya@xxxxxxxxx>]

Dear Ferret Users, 
  
  I want to fill between two line. I tried the following:
  
  use file1.nc , file2.nc , file3.nc , file4.nc
  let TAMA=ta[x=80:85@ave,y=20:25@ave]
  let TA_Mean=(tama[d=1]+tama[d=2]+tama[d=3]+tama[d=4])/4
  let TA_Max= if max(tama[d=1],tama[d=2]) gt max(tama[d=3],tama[d=4]) then max(tama[d=1],tama[d=2]) else max(tama[d=3],tama[d=4])
  plot TA_Mean, TA_Max
  go plot_swath poly/over/pal=gray/nolab TA_Mean, TA_Max
  
  but this gives the error ---- 
  Command file, command group, or REPEAT execution aborted
   *** NOTE: error: data is not a line
  
   If I try the same for a single grid point instead of average over  a region, then there is no problem. I got the same result with the  fill_between script.How can I solve it? 
  
  Many Thanks!
  Jagadish

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