/usr/share/ferret-vis/jnls/go/gridlines.jnl is in ferret-vis 7.3-2.
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!**************************************************************
! Description: plot over the grid of a plot
!
! Example: use levitus_climatology
! shade/lev=25 temp[k=1]
! go land
! go gridlines 30 ! for graticules every 30 degrees
!
! go gridlines 20 1
! will plot every 20 on the physical xaxis a vertical bar
! made of line of 1% of the physical yaxis
! and will plot every 20 on the physical yaxis a horizontal bar
! made of line of 1% of the physical xaxis
!
!
! Notes: default hdelta and vdelta are 1%
!
! Calls: go xgridlines
! go ygridlines
!
! Author: Patrick Brockmann
! Contact: brock@lsce.saclay.cea.fr
!
! Creation: Sept 2000
! Version: 1.0
! History:
! Modification:
!
!**************************************************************
query/ignore $1%<Usage: go gridlines hdelta [vdelta]%
go xgridlines $1 $2%1%
go ygridlines $1 $2%1%
!**************************************************************
set mode/last verify
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