Including the dichroic contribution (FEB-2025)

The dichroic penalty on the receiver temperature was measured in the lab. The extra temperature was then fitted as a linear contribution with frequency (band 1) and a Gaussian bump (band 3, see figure ). The impact on the $\ensuremath{T_\ensuremath{\mathrm{sys}}}$ is shown in figures  (line $\ensuremath{T_\ensuremath{\mathrm{sys}}}$) and (continuum $\ensuremath{T_\ensuremath{\mathrm{sys}}}$).

Figure: Fit of the receiver temperature added by the presence of the dual band dichroic on the optical path. The blue/red curves show the data for a LSB and USB LO tuning, respectively. The two curves per frequency and color show the measured results for the two polarizations.

Figure: Differences (%) in $\ensuremath{T_\ensuremath{\mathrm{rec}}}$, $\ensuremath{F_\ensuremath{\mathrm{eff}}}$ and line $\ensuremath{T_\ensuremath{\mathrm{sys}}}$ introduced in February 2025 between the single band and the new dual band values.

Figure: Differences (%) in $\ensuremath{T_\ensuremath{\mathrm{rec}}}$, $\ensuremath{F_\ensuremath{\mathrm{eff}}}$ and continuum $\ensuremath{T_\ensuremath{\mathrm{sys}}}$ introduced in February 2025 between the single band and the new dual band values.