Logarithmic density (green shaded in g/cm³) and temperature contours (red dashed contours in K) of the disk. The density contours are stopped at a gas density ρ = 10^-34   g/cm³ to avoid color crowding, while the maximum is ρ = 10^-11   g/cm³. The height of the disk atmosphere, i.e. the range where the radial optical depth is less than 1 is shown with white dotted lines in the disk inner region. Comparing the unperturbed case (top) to the disk in which a gap exists at 0.5   AU < R < 2   AU, after depleting the density by 1/1000 (bottom), it is appreciable that however the disk atmosphere is decreased in height, the temperature distribution is not considerably changed.