... When are new gain curves made . ... The fit types used . ... When the new gain curve is installed it contains two dates: . The starting date for this gain curve. ... yyyy ddd This is the start of a gain curve set of data. yyyy ddd is the start date for the gain curve. yyyy is a 4 digit year (2004) and ddd is the day number of the year counting from 1. all other lines are gain curve data. ... col 2 The type of fit used for this gain curve (see below for the codes). col 3 -numcoefs. ...