NIKA2 maps of M 99 at 1.15 mm (left) and 2 mm (right) obtained through the Scanam_nika data reduction pipeline in mJy px⁻¹ (cutouts of 8′×6′; pixel size of 3″). The mean RMS is 0.034 mJy px⁻¹ at 1.15 mm and 0.0055 mJy px⁻¹ at 2 mm. White solid lines show the [2.5, 5, 7.5]×σ contours. The FWHM is ∼12″ at 1.15 mm and ∼18″ at 2 mm, corresponding to ∼0.8 and ∼1.25 kpc (see the white circles, bottom-left).