begin{tikzpicture}

begin{axis}[%
width=4.585in,
height=3.481in,
at={(0.769in,0.47in)},
scale only axis,
xmin=-8.99723178213376,
xmax=73.9972317821338,
xmajorgrids,
y dir=reverse,
ymin=1,
ymax=64,
ymajorgrids,
hide axis,
axis x line*=top,
axis y line*=left
]

addplot[%
surf,
shader=flat,colormap={mymap}{[1pt] rgb(0pt)=(0.0416667,0,0); rgb(23pt)=(1,0,0); rgb(47pt)=(1,1,0); rgb(56pt)=(1,1,0.5625)},mesh/rows=64]
table[row sep=crcr, point meta=thisrow{c}] {%
%
x   y   c\
1   1   0.125\
1   2   0.125\
1   3   0.125\

...

64  63  -0.0883883476483184\
64  64  0\
};
end{axis}
end{tikzpicture}%