Projection map ratio problem

I've been doing some tests, and it seems that the ratio
of the MapBean's screen width and height (r) is different than
the ratio of the MapBean's geographic width and height (geor).
See the results of a few extents below. Can anyone explain
what may be happening here?

minx -130.5 -84.2403 -85.2855
maxx 131.0625 -75.2403 -74.1951
miny -78.062 29.31935 28.64211
maxy 78.06198 36.77261 37.37486
w 465 465 573
h 460 460 539
gr 1.675351 1.207526 1.26997
r 1.01087 1.01087 1.06308

thanks,
Raj

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Raj Singh, Syncline
rs@syncline.com
+1(617)986-1000
MapCiti.com...it's your town on the web
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