Ortho (left) and para (right) continuum subtracted H₂O WBS spectra for IRAS4A shifted so that the source velocity is at 0 km s^-1. The 3₁₂ − 2₂₁ line has been smoothed to 1 km s^-1 resolution and the 2₁₂ − 1₀₁ to 0.5 km s^-1. All other lines are shown at their native WBS spectral resolution. The red line indicates the sum of a three-component Gaussian fit to the line while the green lines show the individual Gaussians.