Central enhancement of the nitrogen-to-oxygen abundance ratio in barred galaxies

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Table 1

Classification of the galaxy sample.

Type	Whole	Barred	Unbarred
	sample	subsample	subsample

Star-forming	139	43	96
Transition	113	66	47
LINER	109	61	48
Seyfert	28	17	11
Unclassified	186	64	122

Notes. Number of active and non-active galaxies in the global sample and in the sub-samples of barred and unbarred galaxies, according to the BTP diagrams in Figs. 3a and b (see Sect. 4 for details).

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