How the cutoffs are defined...
http://forum.arduino.cc/index.php?topic=537413.msg3670319#msg3670319
How the cutoffs are applied...
http://forum.arduino.cc/index.php?topic=537413.msg3668726#msg3668726
How the cutoffs are defined...
http://forum.arduino.cc/index.php?topic=537413.msg3670319#msg3670319
How the cutoffs are applied...
http://forum.arduino.cc/index.php?topic=537413.msg3668726#msg3668726