Null-map power spectrum (top) and transfer function (bottom) of our NIKA2 150 GHz data. The steepness of the power spectrum indicates large-scale correlated noise in our maps, which is accounted for in our analysis by computing a noise-covariance matrix. The transfer function, evaluated on simulations, quantifies the filtering our data went through. The angular scales are correctly recovered (with a transfer function above 80%) for k >  0.5 arcmin⁻¹. For each panel, the shaded gray regions represent the NIKA2 field of view (left) and instrumental FWHM (right).