i'm setting up the --output-tags in my samtools mpileup command line. I want also to include SP (Phred-scaled strand bias P-value), according to the samtools documentation (http://www.htslib.org/doc/samtools-1.3.html) it seems that SP needs a value inside the square brackets. in the documentation it is reported SP [null], should i leave "null" as a default vale or should i change it? any suggestion?
Thank you very much.