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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 mskrifva[/i] [br]Origin Version (Select Help-->About Origin): 7.5 Operating System: Windows 2000 I have a problem with adding a reference line to a set of data and calculating the area of a curve under it. Imagige a study were 8 blood pressure values (72, 68, 64, 66, 76, 79, 76, 73) are measured every 10 minutes. I would then like to draw a graph of this over time and then ad a reference line with the blood pressure value 70. Then I would like to count the area under and over the graph and the reference line. I would be very glad for some help. Kind regards, Markus, Helsinki, Finland [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.