Distribution of log₂ tag intensities of the remaining 12686 unused tags on the array. Log₂ of background intensity = ~6; cutoff for detection was 3X background ( log₂ = ~7). 394 tags were above 3X background; 166 corresponded to repaired tags [6], which have significant sequence similarity to other tags, 116 with no sequence similarity, and 112 corresponded to unused TagModules