生成不同颜色的条形图

Question

我正在尝试绘制如下图表：

我已经编写的代码是：

\begin{figure}[t]
\begin{tikzpicture}
\begin{axis}[
% symbolic x coords={$\tau =5$,$\tau = 10$,$\tau =15$,$\tau =20$, $\tau =25$},
xtick={0.100000, 0.400000, 0.700000, 1.000000},


ylabel={Remaining Energy (Joules)},

xlabel = Time (Megaseconds),
legend style={at={(0.45,1)},
anchor=north,legend columns=-1},
ybar,
bar width=5.8pt,]
\addplot[style={fill=blues3,mark=none}] 
coordinates {(0.100000,5586.3) (0.400000,1149)
(0.700000,1089.8)  (1.000000,5112)};\addlegendentry{Lowest Energy}
\addplot[style={fill=blues2,mark=none}]
coordinates {(0.100000, 9543.32) (0.400000, 11607.5)
(0.700000, 10577.22)  (1.000000,13684.17)};\addlegendentry{ Highest Energy}
\end{axis}
\end{tikzpicture}
\caption{Energy Status of the WSN at Various Point of Time}

\end{figure}

但是，这与我想要的情节完全不符。有人能帮忙吗？谢谢。