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module data_constants use, intrinsic :: iso_fortran_env, only: DP => REAL64 implicit none private public :: num_dimensions, PI, real_zero integer, parameter :: num_dimensions = 3 real(DP), parameter :: PI = acos(-1._DP) real(DP), parameter :: real_zero = real(2**5, DP) * epsilon(1._DP) end module data_constants