For places of articulation further back in the mouth, languages do not contrast voiced fricatives and approximants. Therefore, the IPA allows the symbols for the voiced fricatives to double for the approximants, with or without a lowering diacritic.
for places of articulation further back in the mouth languages do not contrast voiced fricatives and approximants therefore the ipa allows the symbols for the voiced fricatives to double for the approximants with or without a lowering diacritic