When I looked into the code for fun. of covplot, there is a fun. of getChrCov. Because I may want to get the chromosome coverage in table format. But when I run getChrCov, I got an error "no applicable method for 'slice_' applied to an object of class "c('Rle', 'Vector', 'Annotated')" ", because of this part of code in getChrCove "cov <- lapply(cvg, slice, lower=1)". Could you tell me what is the function of "slice" here? Thanks a lot!