I have the following code
ParametricPlot[{{8 Cos[θ], 8 Sin[θ]},
{7.7 Cos[θ],7.7 Sin[θ]},
{7 Cos[θ], 7 Sin[θ]},
{6.5 Cos[θ], 6.5 Sin[θ]},
{6 Cos[θ], 6 Sin[θ]}},
{θ, -5, 5},
Frame -> True, PlotRange -> {{-10, 10}, {-10, 10}}, PlotStyle -> {{Thin, Red},
{Dashed, Blue}, {Dashed, Green}, {Dashed, Purple}, {Dashed, Black}}]
How to add label to each curve and text in the middle saying $a=0.3$ so the plot looks like