Update documentation on axis labeling for figures to includes notes o…

…n siunitx and binop

group-syllabus/figures.md

@@ -137,7 +137,7 @@ Do not show the coordinate direction arrows (usually x, y, z) included in Paravi
 An exception might be creating a simulation video that requires the viewer to know these orientations.
 If you are exporting an image, superimpose your own direction triad if needed.
 
-### Axis bounds
+### Axis labeling
 
 Your axes should, whenever possible, start and end at labeled tick marks.
 This is especially important for log-scale axes.
@@ -147,6 +147,10 @@ In pgfplots, this is achieved with the options:
 Avoid excessive text in tick marks when possible.
 For example, use `1, 2, 3, 4, 5` in units of `kHz` instead of `1000, 2000, 300, 4000, 5000` in units of `Hz`.
 
+In `tikz_preamble.tex`, the package `siunitx` is imported. If possible, use this to format your units. For example, if your units are in microseconds ($\mu \textrm{s}$), use `\unit{\micro\second}`. To access documentation on `siunitx`, visit [the package webpage here](https://ctan.org/pkg/siunitx?lang=en).
+
+In some cases, Tikz will scale the axis label by some $k$-th power of $10$, indicated using $\cdot 10^n$. If possible, it would be preferable to replace the $\cdot$ symbol with $\times$. This may be done by ways of inserting the expression `tick scale binop=\times` in the axis environment.
+
 ### Information quantity
 
 Your figures should only contain the information required to tell the story or demonstrate the desired results.