Main sunspot in active region 12 553 on 2016 June 16 recorded with the CRISP instrument at different wavelengths within the Ca II 8542 Å line. Left panel: continuum intensity I_c image, at +2.4 Å from the line core. Central panel: blue-wing image, at −0.3 Å from the line core. Right panel: line core image. All the images are normalized to the mean continuum value in the quiet sun, I_QS. The umbra-penumbra boundary (white contours) is at I_c/I_QS = 0.45 and the outer penumbral boundary (black dashed contours) is at I_c/I_QS = 0.98. Black arrows point toward the disk center. Small colored squares on the continuum image highlight the location of three PMJs referred to as PMJ 1 (red), PMJ 2 (green), and PMJ 3 (cyan) in the main text. The images correspond to the frame in which PMJ 1 displays the maximum blue-wing brightness.