# k = 2 Pi / L
#L          # -D_s   (as defined in Eqs. 28 and 29)      #coments 
#0.01      -0.0061909842      	       	   	         #not used for fit
0.1        -0.00040954194      
0.25       -0.00016504759
0.5        -7.9734235e-05
1          -4.0616553e-05
2          -1.9791318e-05
5          -7.8315311e-06
10         -3.8915967e-06
20         -1.9708801e-06