View of the protoplanetary disk of HD 135344B at different wavelengths, postprocessing the 2015 coronagraphic SPHERE dataset with PCA-data imputation, which is the dataset that provides the best-quality images of the disk. The different spiral arms are labeled, along with a noticeably brighter region of S1 named the S1 blob. The images were r²-scaled and deprojected, and the center of the images is marked by the white star. The yellow circles indicate the beam size in the IRDIS data, with the black oval the ALMA beam size. The white circle marks the position of the twist. The traces extracted from the image in the K1 band are illustrated in blue. Overplotted with the K2 filter are the 4-sigma contours of the ALMA image from Casassus et al. (2021), deprojected assuming no flaring since submillimeter continuum observations trace the midplane, and rotated according to the 0.85° yr⁻¹ value found in Xie et al. (2024), highlighting the overlap between the twist and the dust filament.