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Notably, the amphetamine contained in the Benzedrine inhaler was the liquid free-base, [note 14] not a chloride or sulfate salt. Three years later, in 1935, the medical community became aware of the stimulant properties of amphetamine, specifically the dextroamphetamine isomer, and in 1937 Smith, Kline, and French introduced tablets under the ...
and the dispersion measure (DM) is the column density of free electrons (total electron content) – i.e. the number density of electrons n e integrated along the path traveled by the photon from the pulsar to the Earth – and is given by =