Bandpass-calibration steps. Top: single-sideband calibrated spectra of Jupiter and the Moon (blue), tuned to the HD, J = 1 − 0 line and scaled in forward-beam brightness temperatures. Center: Bandpass-calibrated spectrum (normalized to unity), using the correlation shown in Fig. A.2. Bottom: After correction for atmospheric transmission and scaled to main-beam brightness temperature (T_mb, line-to-continuum ratio corrected for double-sideband reception).