Filtergram images of the continuum around the Fe I 630.1 nm line (top), the blue wing of the Ca II 854.2 nm line at −0.021 nm (middle), and the blue wing of the Ca II K line at −0.024 nm (bottom). Pink squares show the position of penumbral microjets in the middle and bottom panels. Axes are in arcseconds. Contours outline the inner and outer boundaries of the penumbra. Adapted from Esteban Pozuelo et al. (2019).