Radial-velocity variations of the strongest H2O emission features in W33B. Peaks at different velocities are shown with different symbols. Main features are shown with circles of different kinds. Circles of various sizes denote emission peaks with flux densities that exceeded 700 Jy. The circle size corresponds to the flux density magnitude. For each peak its flux density is given in janskys. Dashed and dotted lines (drawn by eye) present probable radial-velocity drifts of features persisting throughout our monitoring. Characteristic timescales are of the order of months.
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