Revisions of $\ensuremath{T_\ensuremath{\mathrm{rec}}}$ and $\ensuremath{F_\ensuremath{\mathrm{eff}}}$ (JUL-2026)

The $\ensuremath{T_\ensuremath{\mathrm{rec}}}$ and $\ensuremath{F_\ensuremath{\mathrm{eff}}}$ values were revised from in-situ measurements (see figure ). The following changes were made:

• the single band $\ensuremath{T_\ensuremath{\mathrm{rec}}}$ in band 1 was changed from 35.0 K to 37.1 K constant values,
• the dual band $\ensuremath{T_\ensuremath{\mathrm{rec}}}$ in band 1 was changed from a decreasing linear function to a polynomial function of order 2,
• the $\ensuremath{F_\ensuremath{\mathrm{eff}}}$ in band 3 was changed from 0.90 constant value to a decreasing linear function.

The resulting changes in $\ensuremath{T_\ensuremath{\mathrm{sys}}}$ are shown in figures  and .

Figure: Top: single band and dual band receiver temperature join fit for all antennas in band 1. Bottom: forward efficiencies fit for all bands from all antennas measurements.

Figure: Differences (%) in $\ensuremath{T_\ensuremath{\mathrm{rec}}}$, $\ensuremath{F_\ensuremath{\mathrm{eff}}}$ and line $\ensuremath{T_\ensuremath{\mathrm{sys}}}$ introduced in July 2026 compared to the previous version. Top: single band values. Bottom: 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 July 2026 compared to the previous version. Top: single band values. Bottom: dual band values.