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Thank you for finding that previous post from 2013! I was unfamiliar with the term "augmented matrix". I see now that the vertical line in an augmented matrix is not being used as a grouping sign, but rather as a separator. I think the best solution would be to draw the line as a tactile graphic, but if that option is not available to you, using the (456) "vertical line" makes sense. This is not the (1256) "vertical bar" (which has mathematical meaning). This "column separator" usage is similar to the vertical line used in a stem-and-leaf plot which became an option for us in the 2007 BANA Update. You'll note that there is a space before and after the vertical line when used in this manner. Let me know what you think.