A series of concurrent surface-based Standard Umkehr, Short Umkehr, and satellite solar backscattered ultraviolet observations of vertical ozone profile over Boulder, Colorado, is used to evaluate their mutual performance as a co-observing system. An understanding of the evaluation results is facilitated with use of theoretically predicted performance characterstics derived in a previous study of the Umkehr methods. Patterns of observed ozone profile bias, variance, and correlation were found to agree reasonably well with theoretically predicted patterns; however, there are some exceptional departures in the lowest and uppermost levels of the profiles. These departures are thought to be due mainly to measurement inversion algorithm inadequacies, namely, the omission of temperature-dependent ozone absorption information. Other possible causes are also mentioned.