Latest VLA Pointing results Post-fit residuals Measures the difference between antenna performance and the pointing model. These are long timescale errors which are usually removed with reference pointing on timescales of 30 to 45 min. The green curve shows elevation errors, the blue curve shows azimuth errors, and the magenta curve shows the rss. These errors are not removed by reference pointing.
Color coding is the same as above.
Reduced Chisquare Measures the quality of the pointing model fit to the data. A low value can either mean a good fit, or too few single-source scans were used in the fitting. The latter implies that many of the single-source measurements failed, and indicates poor pointing performance for the antenna. This can be checked by looking at the number of measurements plot below. The number of single-source scans that have been used to determine the pointing model parameters.