Hi Susan!
For your follow-up question, we can revisit GSTG 6.5.1.1 and 6.5.1.8:
6.5.1.1 A numeric indicator is not used before a number if it occurs below the number line, whether the number is whole, fractional, decimal, or negative. A numeric indicator is used before a number above the number line. Follow these guidelines for the numeric indicator regardless of whether the number line is transcribed in UEB or Nemeth Code. (See Supplement Example 7: Box-and-Whisker Plots.)
GSTG 6.5.1.8 goes into more detail regarding labels on a number line when labels include letters or symbols other than numbers, but advice in our previous reply regarding placement of your label applies whether using UEB-technical, or Nemeth in a UEB context.
Hope this helps!