Relative gain for the selected sources at different elevations observed with the original FEM model actuator table, and with the modified tables. The error bars of the data points combine the individual error of the Gaussian fit to the cross-scans and the calibration uncertainty of the main calibrator 3C286. For the modified tables, the full corrections calculated by the OOF holography (gravitational model) were applied, and – as a test – also only half of the amount of the corrections was applied. The different scenarios are separated by the gray region: FEM look-up table (default) φ_⊥FEM, new look-up table φ_⊥C, and half new look-up table φ_⊥C/2. The dashed horizontal line shows a relative gain of G_rel = 1, corresponding to no difference from the FEM model.