A simplified example of a .csv (comma-separated values) table file is shown below. The individual numbers can be separated by commas or tabs. Each column of data must have the same number of elements.
Vol Press
0.01 458.58
0.10 417.85
0.20 286.26
0.30 278.52
0.40 267.68
0.50 254.59
0.60 239.05
... ...
2.20 -204.01