It appears that no matter what value I give with the "resolution" parameter I get a rather small 72 dpi image. An example URL is http://www.aavso.org/vsp/chart?name=v452+cas&charttitle=v452+cas&fov=24&resolution=120&maglimit=18&north=up&east=left&forcelines=on&othervars=all [1]. When I click on the resulting chart I get 600x750 chart. I get the same resolution chart when I substitute 150 or 75, or seemingly any other value for resolution.
Thanks,
Shawn (DKS)
Links:
[1] http://www.aavso.org/vsp/chart?name=v452+cas&charttitle=v452+cas&fov=24&resolution=120&maglimit=18&north=up&east=left&forcelines=on&othervars=all
[2] http://www.aavso.org/forums/about-aavso/software-development