Noise power spectra of the CONCERTO data obtained in photometric mode (MPI OFF) with CAP ON. The odd and even columns show the noise power spectra densities for each LEKID and the median value of the corresponding LEKID array, respectively. A clear peak arises at ~50 Hz. The black dashed lines represent the peaks observed at 763 Hz and 1527 Hz in the study by Bourrion et al. (2022). All scans have similar noise power spectra and white noise of $~2.2 \text{Hz}{(\sqrt{\text{Hz}})}^{-1}$. The corresponding observing conditions for the two scans shown here are given in Table 5.