Fig. B.3.

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Pointing residual scatter plots. These diagrams show the error distribution with respect to the central beam of the GBT. Here, ΔEl refers to the error in the elevation direction, and ΔxEl refers to the error in the cross-elevation direction. Blind pointing (a) refers to the pointing performance when the model is applied, but observers do not perform pointing calibrations at the beginning of a session. All-sky relative pointing (b) is the performance an observer would see if the model were applied and if a single pointing calibration were applied at the beginning of an observing session with sources distributed across the entire sky. The pointing measurements included in this plot were collected during nighttime pointing sessions taken between January 2017 and December 2018; wind speeds never exceeded 5 m/s for any of these measurements.
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