Error in using siunitx with Matplotlib/Python-CodePudding

I'm producing a big report with lot's of figures with some LateX content, and to maintain layout coherence I use a predefined mplstyle file with the following related definitions:

# FONT 
font.family: serif
font.size: 9.0
font.serif: Palatino
font.sans-serif: DejaVu Sans
font.weight: normal
#font.stretch: normal

# LATEX 
text.usetex: True

However, I ran into a specific figure where I need to use LateX siunitx. Here is a stripped down version of my code, that includes the solution for this

This exact code runs perfectly fine when I do not try to use siunitx (and consequently 'pgf'). Any idea on how I might fix this?

CodePudding user response：

The problem is unrelated to siunitx. The latex error messages reports the control sequence \leqslant to be undefined, so you either need to replace it with something else or load a package which defines it, e.g.

\usepackage{MnSymbol}