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| module   | tools_const | 
|   | Define usual constants and missing values. 
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| real(kind_real), parameter, public  | tools_const::pi = acos(-1.0_kind_real) | 
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| real(kind_real), parameter, public  | tools_const::deg2rad = pi/180.0_kind_real | 
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| real(kind_real), parameter, public  | tools_const::rad2deg = 180.0_kind_real/pi | 
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| real(kind_real), parameter, public  | tools_const::req = 6371229.0_kind_real | 
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| real(kind_real), parameter, public  | tools_const::reqkm = 6371.229_kind_real | 
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| real(kind_real), parameter, public  | tools_const::ps = 101325.0_kind_real | 
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