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Profile comparison of the Stokes parameters $V$ and $I$ is a powerful toolfor maser data analysis, providing the first direct methods for unambiguousdetermination of (1) the maser saturation stage, (2) the amplification opticaldepth and intrinsic Doppler width of unsaturated masers, and (3) thecomparative magnitudes of Zeeman splitting and Doppler linewidth. Circularpolarization recently detected in OH 1720 MHz emission from the Galactic centerappears to provide the first direct evidence for maser saturation.Comment: 14 pages, 1 Postscript figures (included), uses aaspp4.sty. To appear  in Astrophysical Journa

Polarization of Astronomical Maser Radiation. IV. Circular Polarization Profiles