Hubble dropout selection volumes, no extinction
                  B-dropouts             V-dropouts                       i-dropouts 
Spectrum    zmin    zmax  V(Mpc^3)  zmin    zmax  V(Mpc^3   zmin   zHmax  V_H(Mpc^3)  zGmax  V_G(Mpc^3)
10 Myr      3.53    4.80    3981    4.67    5.71    2990    5.71    7.29    3924       6.62    2335
100 Myr     3.48    4.74    4046    4.62    5.68    3051    5.68    7.24    3897       6.56    2279 
1000 Myr    3.49    4.69    3866    4.60    5.65    3037    5.65    7.21    3893       6.52    2253 
Flat Step   3.66    4.75    3466    4.72    5.70    2797    5.70    7.19    3734       6.47    2007 
Red Step    3.72    4.59    2787    4.69    5.64    2717    5.64    7.14    3785       6.42    2056