Usage

flex [debug] [phony] [residuals] [rms=] [a1=] [a2=] .. [a2=]

flex does a least square fit to the observed pointing errors assuming a functional form for the pointing errors. Different functional forms can be experimented with by creating a small module with a few function calls. See the file flexstd.c for an example. Typical errors are:

• Ha dial error
• Ha scale
• North polar
• East polar
• Declination dial
• RA collimation
• RA/Dec non perpendicularity
• Dec scale

The input data in stdin must contain at least 4 white space delimited fields.

• hour angle
• declination
• observed - predicted hour angle
• observed - predicted declination

All quantities are in decimal degrees. Lines beginning with `#' are treated as comments and are skipped.

flex calculates the rms values of the ha and dec pointing, then fits the functional forms, and prints out the results to stdout.