Two-cloud model calculation of the Mg II k line profile at 02:04:28 UT for pixel y = 79 (Fig. 6d). Situation in which the cloud c2 is located above the cloud c1 along the LOS is shown. (a) Detail of the I₁ profile. The dotted (green) line shows I₀, the background intensity profile (symmetric) made from the red side of the observed intensity profile (part of the mini-flare symmetrical profile). The dot-dashed (orange) line shows I_b, 1 ≡ I₀e^−τ₁, the background intensity attenuated by the cloud c1. The dot-dot-dot-dashed (pink) line shows I_s, 1 ≡ S₁[1 − e^−τ₁], the emission from the cloud c1. The solid (blue) line shows I₁ = I_b, 1 + I_s, 1, the resulting intensity profile when only the background atmosphere and the cloud c1 are along the LOS. (b) Detail of the I₂ profile. The dotted (blue) line shows I₁, the intensity from the background and cloud c1 (as “background” intensity profile for cloud c2). The dot-dashed (light blue) line shows I_b, 2 ≡ I₁e^−τ₂, the intensity from the background and the cloud c1 attenuated by cloud c2. The dot-dot-dot-dashed (purple) line shows I_s, 2 ≡ S₂[1 − e^−τ₂], the emission from cloud c2. The solid (red) line shows I₂ = I_b, 2 + I_s, 2, the resulting (modelled) intensity profile with the background atmosphere, cloud c1, and cloud c2. (c) A comparison of observed (solid, black) and modelled (solid, red) profiles. The background profile I₀ (dotted, green) and the profile I₁ (dashed, blue) are also shown for comparison. The vertical solid black lines in each panel show the LOS velocity values of the considered clouds.