Basic plots for the standard disk model: (1) total hydrogen number density with red/black contours overlaid showing the radial/total extinction of 1; (2) gas temperature with contours overlaid for the gas temperature (white) and dust temperature (black); (3) OH abundance with the vertical extinction of 0.01 and 0.1 overlaid by blue contours and the PDR parameter log χ/n_⟨ H ⟩ = −2, ... −6 overlaid by white contours; (4) CO abundances with gas temperature contours (white) and dust temperature contours (black); (5) water abundance with the total extinction A_V = 1 overlaid in black and the gas temperature contours (white) and (6) HCO⁺ abundance.