ebt.fit and ebt.theta are GRangesList.
fitpar, fitpar.small, res are lists created
by alpine functions. genes.theta is a character vector.
txdf.theta is a DataFrame.Homo_sapiens.GRCh38.84.gtf,
and the genome is BSgenome.Hsapiens.NCBI.GRCh38.minsize=80 and maxsize=350