Left: CH₃OH 5_0, 5 − 4_0, 4 (A) moment 0 map. The color wedge shows the intensity in units of mJy beam⁻¹ km s⁻¹. The cyan contours indicate the H₂CO 3_1, 2 − 2_1, 1 emission of Fig. 1 at 20, 40, and 60 mJy beam ⁻¹. The beam sizes are shown at the bottom left with the relative colors. Middle: spectral profiles of the H₂CO and CH₃OH lines integrated over the H₂CO emitting area. The CH₃OH profile is multiplied by 5. The solid-vertical lines indicate the peaks of the H₂CO profile and correspond to the peaks of the CH₃OH line. The dashed line indicates the source systemic velocity (V_sys = +5.6 km s⁻¹). Right: [CH₃OH]/[H₂CO] abundance ratio inferred for IRAS 04302 is compared with literature values inferred for Class 0 hot corinos, other Class I or early Class II disks observed by ALMA-DOT, Class II disks, and comets (references in the text).