# MATLAB: How to read the data from a fitted graph at specific points

read data from a fitted graph

Hi
I have a graph like the attached image. How to read the data from a graph at specific points.
For example, at the values on Y-axis 0.1, 0.3, 0.5 and 0.8 then what are the corresponding values in the X-axis?
Thanks

yq = [0.1, 0.3, 0.5, 0.8];          % Y Query Pointsxq = interp1(ydata, xdata, yq);     % Interpolated X Values