A search for 6.6680-GHz A+ -methanol masers in the 19 star-forming regions known to contain 12.2-GHz E-methanol masers and lying at declinations below – 42° has led to the detection of masers in every object. This supplements the results of Menten who found A-methanol masers toward all the northern hemisphere E-methanol masering regions.
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MacLeod et al. (1992) studied this question.