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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Anti-Spam Code: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by Israelke@caltech.edu[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): OriginPro 2021b Operating System: Windows 10 64bit I have plots that consist of loading and unloading sections, and I am interested in doing a linear fit on the vertical section at the beginning of the unloading curve, in other words, I am looking for the slope of the dashed lines in the attached image. I would appreciate suggestions on doing this, as the linear fitting feature is not really helping. Thank you [img]https://my.originlab.com/ftp/forum_and_kbase/Images/Micropillar%20compression%20tests_1.png[/img] [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.