[gradsusr] map does not match google earth

[Fernando Montana]

my map generated with 2.1.a1 grads not match when I view in google earth.
How can I adjust it to match (attached)?
Here is the code I am using:
...
'set clevs 30 100 150 200 250 350'
'set ccols 0 10 7 12 8 2'
'set lat -6 13'
'set lon -85 -65'
'set grads off'
'set grid off'
'set gridln off'
'set ylab off'
'set xlab off'
'set frame off'
'set mpdraw off'
'set mpdset hires'
'set gxout shaded'
'set csmooth on'
'd acpr'
'gxprint forecast.png -t 0'
'c'
'set gxout kml'
'set kml forecast'
'd acpr'
...

No need to see the .tif image associated with the kml.
Any suggestions will be appreciated
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