DE_comparison

Create comparison plots for the DE paper

1. test_w_deriv.ipynb: Plotting the derivative of the power spectrum P(z, k) with respect to w0. (similar to Fig. 3)
2. FoM_vs_z.ipynb: Plotting the DE FoM parameter as a function of redshifts. (similar to Fig. 6)
3. code: codes to create data files for 2.