NAME: phasebin PURPOSE: (one line) Compute a phase binned average lightcurve DESCRIPTION: This routine bins lightcurve data as a function of time into a binned composite lightcurve. Bins with no data are not returned. CATEGORY: Photometry CALLING SEQUENCE: phasebin,t,x0,sigx0,t0,period,nbins,rotphase,x,sig INPUTS: t - independent variable (usually time) x0 - dependent variable (usually magnitude or intensity) sigx0 - Uncertainty on x. t0 - Reference time for 0 phase. period- Rotational period to use when binning (same units as t). nbins - Number of bins to break rotation into. OPTIONAL INPUT PARAMETERS: KEYWORD PARAMETERS: OUTPUTS: rotphase - Rotational phase for composite lightcurve. x - composite lightcurve. sig - Standard deviation of the mean in each bin. chi2 - Goodness of fit to data within bin. pop - Number of points in each bin. COMMON BLOCKS: SIDE EFFECTS: RESTRICTIONS: PROCEDURE: MODIFICATION HISTORY: Written 1992 Apr 22, by Marc W. Buie, Lowell Observatory 2000/11/08, MWB, removed use of obsolete ()