Use your favorite software and import the file as a comma-delimited text file. Cricket Graph is also available at Health Sciences Microlab . Start Cricket Graph by double clicking on it. Put your disk in the floppy drive. Close the blank new window that will appear.
Cricket is very slow at opening large data files, so be patient.
When you're done, you'll see your time in Column 1 and Absorbance in Column 2. Highlight all of Column 1 by clicking on the 1 at the top of the column. If your ln values in column 4 have too many digits, adjust the numeric format like you did in step 4. Feel free to rename column 4 to something more appropriate. From the Graph menu, select a New Graph and then a Line chart.