Top: Continuum NOEMA dirty map of CL J1226.9+3332 from the combination of point-source-contaminated LSB and USB data, merged without weighting for the tSZ effect spectral shape. The grey crosses indicate the positions of the three point sources identified from NOEMA data (Table 1). Bottom: Point-source-subtracted continuum NOEMA map of CL J1226.9+3332 cleaned with CLARK (Clark 1980) and natural weighting. The data from different sidebands were combined as described in Sect. 3.1. The map is not corrected for primary beam attenuation. The white contours indicate ±2σ = ±11.2 μJy beam⁻¹ levels spaced by 2σ. The size and orientation of the synthesized beam of NOEMA (4.6″ × 3.8″ at PA = 54°) are indicated in the lower left corners.