This is a fortran subroutine that calculates accurately the nuclear energy generation and neutrino fluxes in main sequence stars. The code is amply documented by comment lines. I maintain the code by including experimental and theoretical improvements as they become available. The reaction rates embodied in the present version of the code were used to calculate the solar models and neutrino fluxes in J. N. Bahcall and M. H. Pinsonneault, Rev. Mod. Phys., 67, 781--808 (October 1995). A number of different groups have implemented this subroutine in their stellar evolution code and have used the subroutine to calculate the fluxes of solar neutrinos.
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