This is observable in the Ha (red) image as dual crosses. The star positions are observable as blue crosses. Herbig Haro twin black holes are supposed to come First before star formation is able to produce CO.
The result : the number of dual BH Ha-crosses is more than double the number of CO crosses ( in blue).
For image See: “Fast and inefficient star formation due to short-lived molecular clouds and rapid feedback” J. M. Diederik Kruijssen et.al. RUG Groningen.
https://arxiv.org/abs/1905.08801
see also: https://www.facebook.com/leo.vuyk/grid?lst=100002068560151%3A100002068560151%3A1535442288&subkey=manage