Comparison between the best-fit RADMC-3D model image and the ALMA observation at Band 6 of IRAS4A1. Left: RADMC-3D model 8 convolved with a 0.078″ × 0.031″ beam. Considering both the major and minor axis cuts, the substructures disappear in the major axis at a scale height of 0.3. The gap radial location is set at 40 au with a small width of 4 au. Right: ALMA continuum unconvolved emission image at 1.2 mm with a zoomed-in view of the A1 source. The respective intensities of each images is shown in the upper color bars.