Correlations of observable K line profile properties for diagnosing vertical velocities in the chromosphere from Model 2. Panel a: the K3 Doppler shift against the vertical velocity at the K3 formation height is indicated. Panel b: the K2 peak separation against the maximum vertical velocity amplitude between K2 and K3 formation heights is shown. Panel c: the average K2 Doppler shift against the averaged vertical velocity at the K2 formation heights is indicated. Panel d: the emission peak asymmetry against the mean vertical velocity between the K2 and K3 formation heights is shown. The panels follow the same format as Fig. 6.
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