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Fig. 3.

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Quality of the inversion fits and number of inversions that satisfy the threshold criterion. Top panels: observed umbral flash profile (black dots), the fit obtained from an inversion whose χ2 is near the chosen threshold (solid blue line), and the fit of the inversion with the worst χ2 (above the threshold) that was included in the analysis (dashed red line). The left panel corresponds to the Ca II 8542 Å line, and the right panel shows the Ca II H line. The vertical dotted lines in the right panel delimit the line core region we employed in the inversions. Bottom panel: temporal evolution of the number of inversions employed for the analysis of each profile at a selected umbral location. The blue shaded areas indicate the temporal steps when the core of the Ca II 8542 Å is in emission. The vertical dotted line corresponds to the time step illustrated in the top panels.

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