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[1] 1GM＝10 ^-50 cm ⁴ ·s·photon ^-1 ，其中photon表示光子个数。

[2] 1ppm=10 ^-6 。 piyPz0kD8gywZ0J7kDqAM+WpMG8TIXlr8P4mFsQGYjZrhC5idskGr4Cp/upKPPm9