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I have a set of thermodynamic data that I need to globally fit to a single equation. I currently have the data in a two column data where every 16 points is a new "set" of data points. I have used my code to fit a single "set" of data but when I try to fit all of my data it doesn't work. My data is pressure on the x-axis and moles on the y-axis. In the full set of data the 4 temperatures are: 521 K (lowest line), 402 K, 320 K, and 274 K (highest line). Any help or direction to go would be great.

Picture 1: Single "set" of data fit code

Picture 1

Picture 2: tab delimited file of the data I plotted

Picture 2

Picture 3: My attempt at fitting the 4 "sets" of data to a single equation. You can see the four "sets" of data at the bottom that I would like to fit.

Picture 3

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    $\begingroup$ Please edit your question show the code you have tried, displayed in Mathematica format. Also, you mention pictures, but none are provided. $\endgroup$
    – bbgodfrey
    May 20 at 19:46
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    $\begingroup$ Please edit your question, and add the code from the images. Posting the code makes it easier for us to try it, rather than typing your code from scratch. $\endgroup$
    – creidhne
    May 20 at 21:12

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