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Hi Elizabeth, the tactile graphics committee would like to reiterate the fact that zig zag patterns should not be added to a TG when they are non-existent in print. One should always strive to make the “material fit” using the G&S 6.6 Graph component guidelines as I mentioned earlier. Now in the event that these “breaks” do exist in print, follow print design. These can be spurred then thermoformed if using the collage method or drawn as lines when using graphics software. Regardless of the method used, you might want to input a transcriber’s note explaining what the interruption method is (lines, zigzags, etc.) and what these breaks achieve.
Attached please find a Cartesian zig-zag interrupted y-axis, followed by a bar-graph break image and TG transformation.
NOTE: THIS IMAGE WAS RETRIEVED FROM: https://peltiertech.com/broken-y-axis-in-excel-chart/