I found these two articles online, one for the HL series and the other for the HR:
http://www.tillotson.ie/docs/techinfo_HL_US.pdf
http://www.tillotson.ie/docs/techinfo_HR_US.pdf
Hope they are useful to someone.
http://www.tillotson.ie/docs/techinfo_HL_US.pdf
http://www.tillotson.ie/docs/techinfo_HR_US.pdf
Hope they are useful to someone.