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Thank you for the reply, I knew it'd be a stupid error! Haha.
Thanks for the hints also, helvetica is a custom .sty, whereas aa.cls is a template from Astronomy and Astrophysics, which is the style I'm trying to emulate with this report. \begin{document} was something I forgot to copy in when I ...

Hi everyone, first post here so please be gentle!

I seem to be having a problem with the creation of a graph using pgfplots in LaTeX. Here is my code:
\documentclass[traditabstract]{aa}
\usepackage{helvetica}
\usepackage[tbtags]{amsmath}
\usepackage{pgfplots}
\usepackage{graphicx}
\usepackage{ulem ...