Table 2: Results of the morphological classification of dust structure and H $\alpha$ nuclear and circumnuclear structure of the 20 galaxies from the $\sigma$ -drop sample. ID of the galaxy (Col. 1); morphological type (RC3, Col. 2); nuclear activity (from NED, Col. 3); distance in Mpc, (Col. 4); B magnitude (NED, Col. 5); axis ratio d/D (NED, except in NGC 1097 where we measured d/D from the H $\alpha$ ring and NGC 6814 that looks face-on), (Col. 6); dust structure within the radius r_c (Col. 7); nuclear H $\alpha$ structure (Col. 8); circumnuclear H $\alpha$ structure (Col. 9). Statements such as ``Ring+Patchy'' describe in which order we find each H $\alpha$ structure, starting at the nucleus.
ID Type Activity Distance B d/D Dust Nucl H $\alpha$ Circ. nucl

(RC3) (NED) (Mpc) Magnitude structure structure H $\alpha$ structure

NGC 1068 RSAT3 Sy1 Sy2 15.3 -21.47 0.87 TW Amorphous Filaments

NGC 1097 .SBS3 Sy1 15.2 -20.89 1.00 LW Peak Diffuse+Ring

NGC 1808 RSXS1 Sy2 10.9 -19.91 0.34 LW Peak Ring+Patchy

NGC 2460 .SAS1 - 23.8 -19.75 0.74 C - -

NGC 2639 RSAR1 Sy1.9 48.7 -21.10 0.76 LW - -

NGC 2775 .SAR2 - 19.2 -20.60 0.79 N - -

NGC 3021 .SAT4 - 23.9 -19.79 0.59 TW - -

NGC 3412 .LBS0 - 11.3 -18.97 0.55 N - -

NGC 3593 .SAS0 H II Sy2 9.9 -18.28 0.39 C Peak Ring

NGC 3623 .SXT1 LINER 12.6 -20.94 0.26 C Peak None

NGC 3627 .SXS3 LINER Sy2 12.8 -21.46 0.45 C Amorphous None

NGC 4030 .SAS4 - 21.1 -20.76 0.71 TW - -

NGC 4303 .SXT4 H II Sy2 23.1 -21.84 0.89 LW - -

NGC 4477 .LBS. Sy2 21.0 -20.43 0.87 TW - -

NGC 4579 .SXT3 LINER Sy1.9 23.0 -21.69 0.78 CS Peak+Bipolar Structure+UCNR Filaments

NGC 4725 .SXR2 Sy2 13.2 -21.69 0.69 C - -

NGC 4826 RSAT2 Sy2 7.5 -20.64 0.49 TW Peak Patchy

NGC 6503 .SAS6 H II/LINER 5.2 -18.70 0.33 C Peak Ring+Patchy

NGC 6814 .SXT4 Sy1.5 22.6 -20.48 1.00 GD - -

NGC 6951 .SXT4 LINER Sy2 24.4 -21.86 0.71 LW Peak Ring

**Table 2:** Results of the morphological classification of dust structure and H $\alpha$ nuclear and circumnuclear structure of the 20 galaxies from the $\sigma$ -drop sample. ID of the galaxy (Col. 1); morphological type (RC3, Col. 2); nuclear activity (from NED, Col. 3); distance in Mpc, (Col. 4); B magnitude (NED, Col. 5); axis ratio d/D (NED, except in NGC 1097 where we measured d/D from the H $\alpha$ ring and NGC 6814 that looks face-on), (Col. 6); dust structure within the radius r_c (Col. 7); nuclear H $\alpha$ structure (Col. 8); circumnuclear H $\alpha$ structure (Col. 9). Statements such as ``Ring+Patchy'' describe in which order we find each H $\alpha$ structure, starting at the nucleus.
ID	Type	Activity	Distance	B	d/D	Dust	Nucl H $\alpha$	Circ. nucl
	(RC3)	(NED)	(Mpc)	Magnitude		structure	structure	H $\alpha$ structure
NGC 1068	RSAT3	Sy1 Sy2	15.3	-21.47	0.87	TW	Amorphous	Filaments
NGC 1097	.SBS3	Sy1	15.2	-20.89	1.00	LW	Peak	Diffuse+Ring
NGC 1808	RSXS1	Sy2	10.9	-19.91	0.34	LW	Peak	Ring+Patchy
NGC 2460	.SAS1	-	23.8	-19.75	0.74	C	-	-
NGC 2639	RSAR1	Sy1.9	48.7	-21.10	0.76	LW	-	-
NGC 2775	.SAR2	-	19.2	-20.60	0.79	N	-	-
NGC 3021	.SAT4	-	23.9	-19.79	0.59	TW	-	-
NGC 3412	.LBS0	-	11.3	-18.97	0.55	N	-	-
NGC 3593	.SAS0	H II Sy2	9.9	-18.28	0.39	C	Peak	Ring
NGC 3623	.SXT1	LINER	12.6	-20.94	0.26	C	Peak	None
NGC 3627	.SXS3	LINER Sy2	12.8	-21.46	0.45	C	Amorphous	None
NGC 4030	.SAS4	-	21.1	-20.76	0.71	TW	-	-
NGC 4303	.SXT4	H II Sy2	23.1	-21.84	0.89	LW	-	-
NGC 4477	.LBS.	Sy2	21.0	-20.43	0.87	TW	-	-
NGC 4579	.SXT3	LINER Sy1.9	23.0	-21.69	0.78	CS	Peak+Bipolar Structure+UCNR	Filaments
NGC 4725	.SXR2	Sy2	13.2	-21.69	0.69	C	-	-
NGC 4826	RSAT2	Sy2	7.5	-20.64	0.49	TW	Peak	Patchy
NGC 6503	.SAS6	H II/LINER	5.2	-18.70	0.33	C	Peak	Ring+Patchy
NGC 6814	.SXT4	Sy1.5	22.6	-20.48	1.00	GD	-	-
NGC 6951	.SXT4	LINER Sy2	24.4	-21.86	0.71	LW	Peak	Ring

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