Homogeneous cloud water grid models with R_gd = 100 and T_dust = T_kin and no central source. The white dots indicate the grid points for which models were run. The transition frequency is shown in each panel in gigahertz. The line intensities for each line are described by a base-10 logarithmic contour and colour scale which is normalised to the 557 GHz line intensity (I_ν ∕I₅₅₇). The green area depicts the region where the line in question has a similar strength to the 557 GHz line. The maximum intensity of the 183 GHz line, which occurs around T_kin = 300 K and n(H₂) = 3 × 10⁷ cm⁻³, is about 10² times stronger than the 557 GHz line intensity.