Intensity formation breakdown figure for the Ca II K line from Model 2. Subfigure a: normal profile with two emission peaks is depicted. Subfigure b: profile with a single emission peak is shown. Subfigure c: pure absorption profile is shown. Subfigure d: profile with a large peak-to-peak separation is depicted. Each image (black corresponds to low values, yellow to high values) shows the quantity specified in its top left corner as a function of frequency from line center (in Doppler shift units) and simulation height z. Multiplication of the first three produces the intensity contribution function in the fourth panel. A τν = 1 curve (green) and the vertical velocity (white solid, positive is upflow) are overplotted in each panel; a vz = 0 line is indicated in the first panel for reference. The upper right panel also contains the gas temperature (dashed) and the line source function along the τ = 1curve in blue for the part of the τ curve blueward of its maximum value and red for the part on the red side of the maximum τ = 1 height, in temperature units specified along the top. The lower right panel also contains the emergent intensity profile (orange), as brightness temperature with the scale along the right-hand side.
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