How to extract the data of the strain versus frequency plot of the Laser Interferometer Space Antenna (LISA): Figure (2) in this paper:
https://arxiv.org/abs/1702.00786
The paper doesn't contain any table for that plot.
Also for experts in gravitational waves, may I ask what is the relation between the energy density of the gravitational waves $\Omega$ and the strain $Hz^{-1/2}$ which is plotted versus frequency in Figure (2).