ALMA observations of the continuum and ¹²CO line. The first five disks show the 690 GHz (440 μm) continuum and the ¹²CO J = 6–5 line, the sixth is the 345 GHz (880 μm) continuum and ¹²CO J = 3–2 line. Left: continuum image. The stellar position is indicated by a white star, the white bar in the upper right corner indicates the 30 AU scale, and the yellow contour gives the 3σ detection limit. The colorbar units are given in Jy beam^-1. Center: zero-moment ¹²CO map. The colorbar units are given in Jy beam^-1 km s^-1. Right: ¹²CO spectrum integrated over the entire disk. The dashed line indicates the zero flux level, and the gray areas indicate the parts of the spectrum affected by foreground absorption (seen in SR21 and SR24S). The beam is indicated in each map by a white ellipse in the lower left corner.