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Jerry --
The scale of the graph is what's important, not the number system used to calibrate it. The number 0.3 represents 1 stop, so 0.1 is 1/3-stop, 0.2 is 2/3-stop, 0.6 is 2 stops, 1.0 is 3-1/3-stops, etc.
To make film and paper graphs look right (so the curves' slopes are consistent visually) the graph axes have to be scaled similarly. For example, if the interval 0.0 to 1.2 (4 stops) on the x-axis measures 3 inches, a similar interval on the y-axis should also measure 3 inches. But the numerical calibration scheme is not important. You might calibrate the x-axis in stops (0, 1, 2, 3, 4...), or in equivalent logs (0.0, 0.3, 0.6, 0.9, 1.2...), then use (one-third-stop) density values on the y-axis (0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2...).
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