Visual Guide to the Frequency Scale

vertical mark Let's start by referencing the scale against a peak of known frequency. Create a mark with Cmd-click and drag it at the center of the reference line. Open the dialog “Format/Axes & Scales”. Enter the reference value. Click on the “OK” button.
dialog correct value

Here's the result:


The mechanism to calibrate the Y scale is similar.
Instead of the vertical mark,
create an horizontal mark with Alt-click.
Continue as above.

horizontal mark

keyboard commands


H or h : scale in Hz


p : scale in ppm


apostrophe : peak-picking in Hz

(press again to revert)


g : grid

(press again to hide)


T : transposition

swaps the X with the Y

be sure it's an upper-case T !

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