Example of a line plot with Y as percent
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Your lab would like to compare chromatogram profiles for gasoline at various octanes for component consistency. An irregular profile could point out quality problems. You want to standardize Y values within components to accentuate difference among profiles.

1    Open the worksheet OCTANE.MTW.

2    Choose Graphs > Line Plot > Without Symbols, Series in Rows or Columns > OK.

3    In Graph variables, enter '900'-'1600'.

4    In Label column, enter 'Octane'.

5    Under Series Arrangement, choose Each row forms a series.

6    Click Plot Options.

7    Check Show Y as Percent.

8    Click OK in each dialog box.

Graph window output

Interpreting the results

The similar chromatogram profiles suggest consistency among components 900-1340. Octane formulations 97.8 and 97.5 have different profiles than the other formulations for components 1360-1600. Compared to the unadjusted profiles, the differences now stand out.