Left: tricolour image (I_E, Y_E, and H_E) of the Puddle cluster with a 2′ × 2′ field of view. The position of the MaDCoWS2 detection is indicated by a light green ‘X’. The coordinates of the Puddle cluster in Euclid Collaboration: Bhargava et al. (2026) are indicated by crosses: light green for the PZWav coordinates and pink for the AMICO coordinates. The most likely photometric members of MaDCoWS2 (galaxies for which the integrated probability density function between z_phot − σ_z and z_phot + σ_z is equal or greater than 0.3) are circled in mauve. The white box indicates the 0$\stackrel{\prime }{.}$3 × 0$\stackrel{\prime }{.}$3 field of view of the zoom-in in the right panel. Right: view of the BCG complex in the Puddle cluster. The white contours indicate the edges of the aperture used to measure the photometry. The white dashed box shows the approximate position of the spectroscopic slit. The centre of the MIPS 24 μm emission is indicated by a black cross.