Fig. 15.
The AFF′ coefficients of an isotropically pumped water maser at B = 20 G as a function of the magnetic field-propagation direction angle cosθ. The panels show different thermal widths vth= (a) 0.6 km s−1, (b) 1.0 km s−1, and (c) 2.0 km s−1. Plots are given for different log(R/gΩ). The LTE solutions (constant over cosθ) of the different hyperfine sub-transitions are indicated by a dotted line.
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