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pub const REFERENCE_SOUND_PRESSURE_AIR_PA: f64 = 20.0e-6; pub const REFERENCE_SOUND_PRESSURE_WATER_PA: f64 = 1.0e-6; pub const REFERENCE_SOUND_INTENSITY_W_M2: f64 = 1.0e-12; pub const REFERENCE_SOUND_POWER_W: f64 = 1.0e-12;