Time sequence of bolometric intensity of three snapshots of the 5 M_⊙ model st35gm04n045 in original resolution (top row) and blurred by a Gaussian (σ = 30 px ≈ 91 R_⊙, bottom row) with an adjusted color scale. We focus our analysis on the dark curved horizontal patch developing on the lower hemisphere of the stellar disc (the dark feature centered around y = −400 R_⊙, z = 0 in the top right frame).