As I thought, the SiPMs and chimneys closest to the backplane are numbers 1 and 16, and those farthest from the backplane and closest to the door are numbers 15 and 30.  | As I thought, the SiPMs and chimneys closest to the backplane are numbers 1 and 16, and those farthest from the backplane and closest to the door are numbers 15 and 30.  |