我在一篇论文中偶然想到使用图片作为图表的 x 轴标签。但是，我遇到了最后一个标签与其他标签距离较远（不对称）的问题，我觉得这很奇怪。具体来说，我谈论的是针对 IBM 的最后一个观察结果。我首先确保所有图片的宽度都差不多，但最初并不是这样。然而，这并没有解决问题，所以我现在有点不知所措。我使用以下代码：
\usepackage{tikz}
\usepackage{pgfplot}
\begin{figure}[h]
\centering
\caption{AMD top 8 search based peers (2016)}
\label{FigAMDtop10SBPpeers}
\begin{tikzpicture}
\begin{axis}[width=15cm,height=8cm,
ymin=0, ymax=8,
xtick pos=lower,ytick pos=left,
xtick style={draw=none},
ylabel = Annual Search Fraction,
yticklabel=\pgfkeys{/pgf/number format/.cd,fixed,precision=0,zerofill}\pgfmathprintnumber{\tick}\%,
axis background/.style={fill=gray!5},
symbolic x coords={\includegraphics[scale=0.02]{Logo/intellogo.png},\includegraphics[scale=0.0175]{Logo/HPlogo.png},\includegraphics[scale=0.0175]{Logo/nvidialogo.png},\includegraphics[scale=0.0175]{Logo/broadcomlogo.png},\includegraphics[scale=0.0175]{Logo/texasinstrumentslogo.png},\includegraphics[scale=0.05]{Logo/googlelogo.png},\includegraphics[scale=0.02]{Logo/microsoftlogo.png}),\includegraphics[scale=0.007]{Logo/ibmlogo.png}
},
xtick=data,
nodes near coords={\pgfmathprintnumber\pgfplotspointmeta\%},
nodes near coords style={/pgf/number format/fixed},
]
\addplot[ybar,fill={rgb:red,0;green,47;blue,135}] coordinates {
(\includegraphics[scale=0.02]{Logo/intellogo.png},6.1529271206690564)
(\includegraphics[scale=0.0175]{Logo/HPlogo.png},1.3888888888888888)
(\includegraphics[scale=0.0175]{Logo/nvidialogo.png},1.045400238948626)
(\includegraphics[scale=0.0175]{Logo/broadcomlogo.png},0.9557945041816009)
(\includegraphics[scale=0.0175]{Logo/texasinstrumentslogo.png},0.9109916367980884)
(\includegraphics[scale=0.05]{Logo/googlelogo.png},0.6869772998805257)
(\includegraphics[scale=0.02]{Logo/microsoftlogo.png},0.6571087216248507)
(\includegraphics[scale=0.007]{Logo/ibmlogo.png},0.6571087216248507),0.6421744324970132)
};
\end{axis}
\end{tikzpicture}
\end{figure}
然后产生以下内容：
有人知道为什么它不再对称，以及如何修复它吗？