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COMMON STOCK AND DIVIDENDS (Tables)
 12 Months Ended
Dec. 31, 2017
COMMON STOCK AND DIVIDENDS [Abstract]  
Common Stock
As of December 31, 2017, 2016 and 2015, TGS’ common stock was as follows:

Common Shares Class
(Face value $ 1, 1 vote)
Amount of common stock, subscribed, issued, paid in, and authorized for public offer
Class “A”
405,192,594
Class “B”
389,302,689
 
794,495,283