Table 1. Number of background dependent and independent modifiers recovered by chromosome arm and deletion collection.

Chromosome arm	2L	2R	3L	3R
Modifier proportion in DrosDel (Background dependent/Total # of modifiers)	8/9 = 89%	10/15 = 67%	22/30 = 73%	19/25 = 76%
Lines Screened	94	39	59	95
Modifier proportion in Exelixis (Background dependent/Total # of modifiers)	20/33 = 60%	19/25 = 76%	17/23 = 74%	32/38 = 84%
Lines Screened	125	82	84	145

Similar results were obtained from the linear model, adjusting for multiple contrasts (see results).