Left hand side of Eq. (18) (minus 1) plotted as solid curves for the observational (non-angular) frequencies of 1 MHz and 1 GHz. The right hand side of the equation (minus 1) for vcs = 0.9999995c (upper) and vcs = 0.99999995c (lower) are plotted as the dashed horizontal lines, so the solutions to Eq. (18) are the intersection points between solid and dashed lines.
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