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We have late breaking amendments to our response.
When TGs exist in a Nemeth context, the use of uncontracted words as labels is permitted, but our TG experts agree that the labels in your samples should be keyed and the single-word switch indicator should not be used. This will ensure "cleaner" graphics that allow the reader more space to investigate the graph itself. Additionally, in the case of these images the key will likely fit on the same page.
Please see the new PNG file showing examples of key items for your first and third TG. There were some errant braille symbols in the original.
For the middle image where the curve meets the X-axis at 0, because there is little space for the word "Focus" it should also be keyed. The word "Directrix" will perhaps fit without interfering with other features. If so, it <u>could be</u> brailled in full, or keyed as a textured line.
No keys or labels should cross the axis or graph lines.