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Ontar Corporation - is a research and development company, which specializes in atmospheric sciences and other tasks.

Ontar was founded in 1981, and became a reseller of software in the field of atmospheric radiation. Ontar launched PCTran in 1987, in that time it was one of the first PC based software for high spectral resolution calculations of atmospheric transmission. PcTran (based on MODTRAN) allows to calculate radiances.

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