Question about MP_score_all.R

[Taeim-Kwon]

Hi, I have a question about the rscript for MP_score_all.R which caps the relative expression levels to reduce influence of extreme values. I believe this is the line 187, but I was wondering why xout[xout < -3] <- 3, not xout[xout < -3] <- (-3)?

xout[xout > 3] <- 3; xout[xout < -3] <- 3 # Cap relative expression levels to reduce influence of extreme values.

I was confused because some mp score tables from 3CA had mp score > 3 or <-3.