Gas giant candidate from our original NOEMA proposal. The galaxy was confirmed at z_spec = 1.38. Top Left: 5″.0 HST F814W cutout of our source with ALMA 870 µm 2, 3, 5, and 8σ levels shown in green. In the bottom left we show the size of the ALMA beam. Top right: RGB composite with blue: HST/F814W, green: UVISTA/H, and red: UVISTA/K_S. Bottom left: extracted spectrum of the CO (2−1) line for our galaxy – ID 10100707. The double Gaussian fit to the spectrum is shown in blue and red, while the sum of the two is represented by a dashed black line. Shaded maroon region shows the channels used to extract the line flux. Bottom right: 20″.0 RGB cutout of our source. We additionally show the 2, 3, and 5σ contours of the CO(2−1) line. The solid white ellipse displays the NOEMA beam size.