Trace of the CRIRES+ detector for a single order. Top panel: 2D detector image of the companion. The hatched area corresponds to the noise estimation region. The spectrum of the companion is located at the center of the image, around the y-pixel number 100. Around y-pixel 90 is the residual MACAO internal source fiber signal after background subtraction. Around y-pixel number 115 and y-pixel number 85, we can see the signal of 2 of the 3 reference fibers. The bad pixels are depicted in white. Bottom panel: normalized profile between y-pixels 90 and 110 of the signal at x-pixels 340, 480 and 620 for the star (solid lines) and the companion (dashed lines). The extracted signal area is represented by the vertical red dashed lines.