Example of channel maps obtained with MCFOST for the ¹²CO (top row) and ¹³CO (bottom row) isotopologues, for a simulation with disc mass of M_d = 0.1 M_⊙. Different velocity channels are displayed, from 0.25 to 0.75 km s⁻¹ (going from left to right). The chosen Gaussian beam used to convolve the image matches the value of the MAPS survey (0.1″), and is shown with a grey circle in the left bottom corner of each channel map. The velocity resolution is chosen to be 0.1 km s⁻¹ (as in the MAPS survey).