Moment 0 maps of selected O-COMs in the representative source G19.88-0.53. Contours and beams are the same as those in Fig. 1. We chose the strongest and unblended (or less blended) line in the upper tuning to make a moment 0 map of each species. The quantum numbers and the upper energy level are indicated in white bold text at the bottom of each panel. The images are integrated over the FWHM with respect to the line center.