Comparison of S/N values of normal mode 1.4 GHz observations of millisecond pulsars with NUPPI, calibrated using the ideal feed assumption (IFA) calibration model, and using improved calibration models obtained from 0/0, 0/1, and 1/1 analyses. The middle panel includes a zoomed-in image of the values near zero. MSP observations within 30 days of MJD 59370 are shown as blue circles, those conducted within 30 days of MJD 60240 are shown as orange squares, and those within 30 days of MJD 60461 are displayed as green triangles.