IRIS slit-jaw images of the region within the rectangle in Figure 1(a) at (a) 1330 Å (b) 1400 Å, (c) 2796 Å, and (d) 2832 Å, acquired on 2015 December 16. The overlaid color contours indicate the radio brightness temperature at 3 mm observed by ALMA, corresponding to the same brightness temperatures as in Figure 1(d).