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[ferret_users] plot/vs and axes



Ferret users,

I'm wondering how to keep a line plotted by a PLOT/VS
command in subsequent overlays:

1. Plot the line using PLOT/VS .
2. "SHADE/OV var" would erase the line.

I notice that the SHADE/OV command doesn't honor the
coordinates set by PLOT/VS .

A complete example is attached.

I don't want the SHADE command to erase the line.
I know a workaround is to SHADE, PLOT/VS, and SHADE,
but if possible, I'd like to avoid the redundant
first SHADE .

Regards,
Ryo
! --- example ------------------------------
let xpnts = {20,180}
set var/units=degrees_east xpnts
let ypnts = {-80,80}             
set var/units=degrees_north ypnts

set data coads_climatology

! In the following sequence, the SHADE
! command erases the line.
plot/lines/thick=3/vs xpnts,ypnts
shade/l=1/ov SST     !! --> Erases the lines

! The following sequence plots the line
! over the shading.
shade/l=1 SST 
plot/lines/thick=3/vs/ov xpnts,ypnts


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