为什么这里有这个随机字母‘y’？

Question

我正在为一个班级制作文档，遇到了一个奇怪的问题。文档右上角有一个神秘的字母“y”，我不知道它从哪里来的，也不知道如何去掉它。代码如下：

\documentclass[10pt]{article}
\usepackage{epstopdf} 
\usepackage[dvips]{graphicx}
\pagenumbering{gobble}
\begin{document}

\begin{huge}
    {\centering
    Gnuplot and \LaTeX\ \footnote[1]{Document author: James Andrews}\par
    }
\end{huge}

\bigskip

Gnuplot is a versatile freeware plotting program. it is available for most platforms. To get Gnuplot see

\noindent http://www.cs.dartmouth.edu/gmu/gnuplot\_info.html.

To make the plot below, I used a size setting of '0.7,0.7'. Note the arrow from \textbf{P} at $(\sin(0), \cos(0),0)$ to the point \textbf{Q} at $(\sin(10*\pi),\cos(10*\pi),10*\pi)$. Also note the numbered axis and the title. They were all created by Gnuplot.

\begin{figure}[h!]
\centering
\includegraphics{project4.eps}
\caption{This graph was created with Gnuplot using the 'postscript eps' terminal setting}
\end{figure}

\end{document}

以下是它生成的文档：

如您所见，右上角有一个字母“y”。我知道这与我的身材有关，因为当我删除它时它就不存在了。这里发生了什么？