PGF 图：如何为同一个 x 标签绘制两个相邻的条形图

Question

我想绘制最小、最大、平均图。现在我想绘制两个相邻的条形图，它们具有相同的 x 值。现在我有以下代码：

\begin{tikzpicture}[scale=1.0] 
\begin{axis} [
    width  = 0.32*\textwidth,
    height = 6cm,
    symbolic x coords={L1, L2, L1+SSIM},
    xtick=data,
    /pgf/number format/.cd,
    use comma,
    1000 sep={},
    title style={yshift=1.5ex, font=\bfseries},
    title={}
]
\addplot+[black, very thick, forget plot,only marks] 
  plot[very thick, error bars/.cd, y dir=plus, y explicit]
  table[x=x,y=mean_mae,y error expr=\thisrow{best_mae}] {\mytable};
\addplot+[black, very thick, only marks,xticklabels=\empty] 
  plot[very thick, error bars/.cd, y dir=plus, y explicit]
  table[x=x,y=mean_mae,y error expr=\thisrow{worst_mae}] {\mytable};
 \addplot+[blue, very thick, forget plot,only marks] 
  plot[very thick, error bars/.cd, y dir=plus, y explicit]
  table[x=x,y=mean_mae,y error expr=\thisrow{best_mae}] {\mytable};
\addplot+[blue, very thick, only marks,xticklabels=\empty, xshift=1mm] 
  plot[very thick, error bars/.cd, y dir=plus, y explicit]
  table[x=x,y=mean_mae,y error expr=\thisrow{worst_mae}] {\mytable};

\end{axis} 
\end{tikzpicture}

以此图作为结果：

但如您所见，它在黑线上方绘制了一条蓝线。但我想让它们彼此相邻。我可以在 \addplot 中添加类似 shift 的功能吗？