GrADS: How to draw a Hovmoller (or Hovmuller) diagram?

Output image

The script:

*********HOVMOLLER**********

'reinit'

'set display color white'

'c'

'set grads off'

'set grid off'

'run colors.gs'

'set xlint 6'

'set xlopts 1 6 0.13'

'set ylopts 1 6 0.13'

'sdfopen file9.nc'

'set t 1 68'

'define plon1=ave(uas,lon=70,lon=90)'

'set lat 0 37'

'set grads off'

'set clab off'

'set x 1'

'set ylabs 1989 | 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 '

*'set parea 0.7 3.7 0.81 7.81'

'set display color white'

'set gxout shaded'

'color 0 10 1 -kind grainbow'

'd plon1'

'run cbar'

*'xcbar 0.69 6.97 0.35 0.51 -fw 0.08 -fh 0.09 -fs 1 -line on -edge triangle -dir h'

'set string 1 l 6'

'set strsiz 0.11'

'draw title Hovmoller diagram'

*'draw string 0.7 7.93 ERA'

'printim output.png'