Spectra of the H₂CO, HDCO, and D₂CO lines integrated: on the entire disk (out to a radius of $1\stackrel{″}{.}3$, 1st column), on the SE disk side (2nd column), on the NW disk side (3rd column). The red dashed line indicates the systemic velocity, V_LSR = +2.8 km s⁻¹. The line transition, frequency, and upper level energy are labeled on the upper-left of the panels in the first column.