id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc
1287	zero points in psastro and addstar	eugene	eugene	"psastro measures a zero point as <M_ref - M_raw - 2.5log(exptime)>

addstar uses this value to set Mcal.

Both currently ignore airmass and color terms

psastro uses photcode values from the recipe file; addstar (and all of DVO) uses photcodes from the photcode table.

 "	defect	new	normal		DVO		normal