+=item B<sample_name.sam.gz>
+
+Only generated when the input files are raw reads instead of SAM/BAM format files
+
+It is the gzipped SAM output produced by bowtie aligner.
+
+=item B<sample_name.time>
+
+Only generated when --time is specified.
+
+It contains time (in seconds) consumed by aligning reads, estimating expression levels and calculating credibility intervals.
+