, adopting perfect foreground subtraction and calibration, and considering each of the 00 frequency channels.[]{data-label="MC_corr_avg_ideal"}  [width=0]{}    --------------------------- ----------- ---------------- ------------------- ---------------- ----------------------- ---------------------- ---------------------- ---------------------- ---------------------- ----------------------- -------------------- --------------------     [**$\sigma$ level**]{}                                                                                                                                                                                                                                           \[\] [**significance**]{}   blackbody                    (units $00^{-0}$)                     $0 \times 00^{-0}$          $00^{-0}$              $00^{-0}$              $00^{-0}$          $0 \times 00^{-0}$     $-0 \times 00^{-0}$    $0 \times 00^{-0}$   $0 \times 00^{-0}$                                            $I_0^{\rm bf}$     $+ 0\,\sigma$     $ - 0\,\sigma$                                                                                                                                                                                 \[\]                              $0.0$              $0.0$             $0.0$        $0.00 \times 00^{-0}$   $0.0 \times 00^{-0}$   $0.0 \times 00^{-0}$   $0.0 \times 00^{-0}$   $0.0 \times 00^{-0}$   $-0.0 \times 00^{-0}$       $00^{-0}$        $0 \times 00^{-0}$              Case                 (0)           (0)                (0)               (0)                  (0)                    (0)                    (0)                    (0)                    (0)                    (00)                   (00)                 (00)              $(0)$                $0$         $00000$            $00000$            $0000$              $0.00$                  $000.$                 $00.0$                $0.000$                $0.000$                $-0.000$               $-0.000$              $00.0$           \[\] $(0)$            $00000$         $0$              $0000$             $0000$              $00000$                $00000$                $00000$                $00000$                $00000$                 $00000$               $00000$              $00000$           \[\] $(0)$            $00000$        $0000$              $0$              $0000$              $00000$                $00000$                $00000$                $00000$                $00000$                 $00000$               $00000$              $00000$           \[\] $(0)$            $0000