Wayne, The horizontal axis represent the 16-bit RGB digital code value sent to the monitor for display while the vertical axis represent the monitor response (Luminance). I'm surprised you're having difficulty viewing the PDF? Are you able to zoom in Acrobat? / Roger -----Original Message----- From: Wayne Bretl <waynebretl@cox.net> Sent: Thursday, January 9, 2020 10:22 PM To: graxx@videotron.ca; 'Andrew Rodney via colorsync-users' <colorsync-users@lists.apple.com> Subject: RE: Monitor Luminance pattern Having a hard time interpreting this without knowing what the two axes are, and whether they are linear or logarithmic. Plus, the notations are practically impossible to read even on my big monitor.