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The MP diplexer opens the possibility to perform a true measurement of the image gain tex2html_wrap_inline1278 , an essential ingredient of spectral calibration. Some tests have been made, observing the same line in near-SSB mode and near-DSB mode, and comparing the derived intensities on the tex2html_wrap_inline1280 scale (which should be equal, of course). Preliminary results are encouraging but need to be confirmed by systematic tests.