begin{figure}
centering
subfloat[Fig 1]{
    begin{tikzpicture}[trim axis left,trim axis right]
        begin{axis}[
            grid=major,
            scaled ticks=false,
            x post scale={0.8},
            y post scale={1.25},
            xmin=1,xmax=5,
            ymin=0,ymax=0.07,
            tick label style={/pgf/number format/fixed},
            ylabel style={rotate=-90},
            xlabel={r},
            ylabel={$displaystyle frac{V_{test}}{V_{x}}$},
            legend cell align=left,
            legend entries={,$Psi=0$,,$Psi=2pi$,,$Psi=4pi$}
        ]

            addplot [thick, blue] table [col sep=comma] {test.csv};
        end{axis}
    end{tikzpicture}
}
hfill
subfloat[Fig 2]{
    begin{tikzpicture}[trim axis left,trim axis right]
        begin{axis}[
            grid=major,
            scaled ticks=false,
            x post scale={0.8},
            y post scale={1.25},,
            xmin=1,xmax=5,
            ymin=0,ymax=0.07,
            tick label style={/pgf/number format/fixed},
            ylabel style={rotate=-90},
            xlabel={r},
            ylabel={$displaystyle frac{V_{test}}{V_{x}}$},
            legend cell align=left,
            legend entries={,$Psi=0$,,$Psi=2pi$,,$Psi=4pi$}
        ]
            addplot [thick, olive] table [col sep=comma] {test.csv};
        end{axis}
    end{tikzpicture}
}
caption{Sample image}
end{figure}