Hi, How could I add labels to the data track? simple example codes: xx.1 <- data.frame(names = LETTERS[1:10], start = seq(1, length = 10, by = 3), end = seq(2, length = 10, by = 3), value = sample(1:100, 10)) itrack <- IdeogramTrack(genome = "hg19", chromosome = 1, showBandId = TRUE, cex.bands = 0.3) gtrack <- GenomeAxisTrack() xTrack <- DataTrack(data = t(as.matrix(xx.1[, 4])), start = xx.1[, 2], end = xx.1[, 3], genome = "hg19", name = "test", chromosome = 1, pch = 20, cex = 0.8) plotTracks(list(itrack, gtrack, xTrack), from = 1, to = 40, type = "p", background.title = "brown") How could I add labels (A-J, for example) to the dots? Is there a function in Gviz similar to "text"? Best, Chunxuan. [[alternative HTML version deleted]]