## Receiver temperature

The receiver temperature has two main contributions.

- The first one comes from the receiver when used in single band mode. The quality of current receivers and associated optics ensures that this one is to first order independent of the radio-frequency for each receiver, except at the edges of the receiver band. We thus model it as a constant receiver temperature per band. This contribution is shown on the bottom panels of Fig. to .
- The second ones comes from the dichroic that splits the beam as a function of the wavelength when in dual band mode. The figures in Appendix show the variations of the dichroic receiver temperature as a function of the radio frequency. This contribution has a non-negligible contribution to the overall receiver temperature budget. We thus only add it when in dual band mode. Moreover it varies much as a function of the radio frequency. We thus model it as the sum of a linear contribution, plus a Gaussian centered around 240 GHz. This last bump corresponds to a physical phenomenon, named Wood anomaly, which occurs in the dichroic when it operates in reflection under oblique incidence.