Upper figure: trichromic image of the ELDL area (blue is for V-band MUSE reconstructed image, green for the I-band MUSE reconstructed image, and red is the narrowband [OII]+Hβ+[OIII] MUSE reconstructed image). Upper red ellipse is the area where the spectrum of ELDL was extracted and lower ellipse is the region where the background was estimated. The large green circle is a 100 kpc radius region and the green cross is the position of the BCG. [OII]+Hβ+[OIII] residual image from OV_WAV is shown as cyan contours. These contours start at the 2.5σ level and progress by steps of 0.5σ. Lower figure: calibrated spectrum of the ELDL.