pxcsao works exactly like xcsao, with the
additional feature that the results for a single file are saved in the
task parameter file. This makes them accessible by scripts. For example,
pixel shifts from cross correlation can be used to adjust wavelength
calibrations, and R-values from correlations of "sky" spectra against
spectra of galaxies and stars can be used to eliminate those spectra
contaminated by objects.
PASP Paper on XCSAO and RVSAO package
"RVSAO 2.0: Digital Redshifts and Radial Velocities"
Michael J. Kurtz and
Douglas J. Mink, 1998,
PASP, v. 110, pp. 934-977.