Refraction index: 1.492 
Focal length from backside: 6.3 
Total beamwidth: 45 
Base thickness: 0 
Diameter: 20 

Radius         Thickness     -rad md1.25   thi md1.25
10.00   0.00   0.00   0.00  
 9.80   0.00   0.16   0.00  
 9.81   0.31   0.15   0.25  
 9.60   0.30   0.32   0.24  
 9.61   0.62   0.31   0.49  
 9.39   0.60   0.49   0.48  
 9.41   0.93   0.48   0.75  
 9.19   0.91   0.65   0.73  
 9.19   1.25   0.65   1.00  
 8.98   1.24   0.82   0.99  
 8.97   1.57   0.83   1.25  
 8.76   1.58   0.99   1.26  
 8.73   1.89   1.01   1.51  
 8.54   1.93   1.17   1.54  
 8.49   2.21   1.21   1.77  
 8.31   2.29   1.35   1.83  
 8.23   2.54   1.42   2.03  
 8.06   2.66   1.55   2.13  
 7.96   2.88   1.64   2.30  
 7.80   3.03   1.76   2.42  
 7.67   3.23   1.86   2.58  
 7.52   3.40   1.99   2.72  
 7.37   3.59   2.10   2.87  
 7.21   3.77   2.23   3.02  
 7.05   3.96   2.36   3.17  
 6.88   4.15   2.50   3.32  
 6.70   4.34   2.64   3.47  
 6.52   4.53   2.78   3.62  
 6.33   4.72   2.93   3.77  
 6.13   4.91   3.09   3.93  
 5.93   5.10   3.26   4.08  
 5.71   5.29   3.43   4.23  
 5.49   5.47   3.61   4.38  
 5.26   5.66   3.79   4.53  
 5.02   5.84   3.99   4.67  
 4.76   6.02   4.19   4.82  
 4.50   6.19   4.40   4.96  
 4.23   6.36   4.62   5.09  
 3.95   6.53   4.84   5.22  
 3.65   6.68   5.08   5.35  
 3.35   6.83   5.32   5.46  
 3.04   6.97   5.57   5.57  
 2.72   7.09   5.83   5.67  
 2.39   7.21   6.09   5.77  
 2.05   7.31   6.36   5.85  
 1.71   7.40   6.63   5.92  
 1.36   7.47   6.92   5.98  
 1.00   7.53   7.20   6.02  
 0.64   7.57   7.49   6.06  
 0.28   7.59   7.78   6.07  
-0.08   7.60   8.06   6.08