Table 1: Ionized-gas velocity gradients observed along the minor axis of the disk galaxies listed in RSA Catalog.

Object		 Morph. Type D25 i PA$_{\rm MJ}$ B0T cz Class Obs. PA$_{\rm MJ}$ Obs. PA$_{\rm MN}$ References
  [RSA] [RC3] ['] [$^\circ$] [$^\circ$] [mag] [ ${\rm km\;s}^{-1}$]   [$^\circ$] [$^\circ$]  

(1)		 (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12)

S0
IC 4889 S01/2(5) E5+ 2.9 56 0 11.91 2526 O 0 90 Corsini et al. 2000
NGC 1947 S03(0) S0 pec 3.0 32 119 11.50 1157 O 120 30 Mollenhoff 1982
                  120 30 Bertola et al. 1992b
NGC 2685 S03(7) pec (R)SB0+ pec 4.5 60 38 11.82 869 G 40 130 Schechter & Gunn. 1978
NGC 3414 S01 S0 pec 3.5 45 179* 11.86 1434 G 25 115 Lake & Dressler 1986
NGC 3998 S01 S00(r)? 2.7 34 140 11.49 1066 C ... 45 Blackman et al. 1983
                  140 50 Fisher 1997
NGC 4026 S01/2(9) S0 sp 5.2 80 178 11.59 930 G 178 88 Fisher 1997
NGC 4111 S01(9) S0+(r): sp 4.6 83 150 11.60 815 G 150 60 Fisher 1997
NGC 4383 S0: Sa pec? 2.0 60 28 12.38 1663 Z 208 118 Rubin et al. 1999
NGC 4710 S03(9) S00(r)? / 4.9 81 27 11.80 1119 G 27 117 Rubin et al. 1999
NGC 5084 S01(8) S0 sp 9.3 88 80 11.28 1706 G 80 170 Zeilinger et al. 1990
NGC 5128 S0+S pec S0 pec 25.7 40 35 7.30 538 O 35 125 van Gorkom et al. 1990
NGC 5266 S03(5) pec (prolate) S0-: 3.2 50 19 11.50 3074 O 114 15 Caldwell 1984
NGC 5363 [S03(5)] I0 4.1 ... 135 ... 1121 Z 135 45 Sharples et al. 1983
NGC 5866 S03(8) S0+ sp 4.7 68 128 10.83 769 Z 128 38 Fisher 1997
NGC 5898 S02/3(8) E0 2.2 25 37* 11.92 2209 O 66 156 Caon et al. 2000
NGC 7332 S02/3(0) S0 pec sp 4.1 78 155 11.93 1202 O 155 65 Fisher at al. 1994

S0a/Sa,SB0/Sa,SB0/SBa
IC 5063 S03(3) pec/Sa S0+(s): 2.1 49 116 12.58 3408 G 115 25 Danziger et al. 1981
NGC 3489 S03/Sa SAB0(rs) 3.5 56 70 11.15 690 Z 76 166 Caon et al. 2000
NGC 2787 SB0/a SB0+(r) 3.2 51 117 11.61 649 O 117 27 Vega Beltràn, priv. comm.
NGC 3941 SB01/2/a SB00(s) 3.5 50 10 11.25 934 O 10 100 Fisher 1997
NGC 4036 S03(8)/Sa S0- 4.3 69 85 11.49 1397 O 85 175 Fisher 1997
NGC 4546 SB01/Sa SB0-(s): 3.3 66 78 11.25 1014 O 135 45 Bettoni & Galletta 1997
NGC 7049 S03(4)/a S00(s) 4.3 47 57 11.57 2198 C 57 147 Corsini et al. 2003
NGC 7377 S01(3)/Sa S0+(s) 3.0 34 101 11.93 3339 O 101 11 Corsini et al. 2003

Sa
NGC 1316 Sa pec (merger) SAB00(s) pec 12.0 46 50* 9.40 1793 I 50 140 Vega Beltràn, priv. comm.
NGC 2782 Sa(s) pec SABa(rs) pec 3.5 43 ... 12.01 2532 C 90 0 Sakka et al. 1973
                C 75 165 Jogee et al. 1999
NGC 2855 S(r) (R)S0/a(rs) 2.5 27 130* 12.29 1910 C 120 30 Corsini et al. 2002
NGC 2992 Sa (tides) Sa pec 3.5 75 15* 12.16 2334 I 17 100 Márquez et al. 1998
NGC 3626 Sa (R)S0+(rs) 2.7 45 157 11.62 1438 I 157 67 Haynes et al. 2000
NGC 3885 Sa S0/a(s) 2.4 69 123 12.30 1918 O 123 33 Corsini et al. 2003
NGC 3900 Sa(r) S0+(r) 3.2 59 2 12.17 1702 C 2 92 Haynes et al. 2000
NGC 4224 Sa Sa(s): sp 2.6 69 57 12.52 2574 C 57 147 Corsini et al. 2003
NGC 4235 Sa Sa(s) sp 4.2 82 48 11.89 2343 I 48 138 Corsini et al. 2003
NGC 4424 S(a?) pec SBa(s) sp 3.6 62 95 11.94 447 G 95 185 Kenney et al. 1996
NGC 4586 Sa Sa(s): sp 4.0 73 115 12.11 813 C 115 25 Corsini et al. 2003
NGC 4698 Sa Sab 4.0 53 170 11.24 1032 C 170 80 Sarzi et al. 2000
NGC 4772 Sa: Sa 3.4 62 147 11.89 1042 C 147 57 Haynes et al. 2000
NGC 4845 Sa Sab sp 5.0 79 89 11.42 1125 G 78 168 Bertola et al. 1989
NGC 4984 Sa(s) (R)SAB0+(rs) 2.8 38 90 12.03 1243 O 90 0 Corsini et al. 2003
NGC 5854 Sa SB0+(s) sp 2.8 77 55 12.69 1668 Z 55 145 Haynes et al. 2000
NGC 7213 Sa(rs) Sa(s): sp 3.1 27 124* 11.13 1803 O 124 34 Corsini et al. 2003

SBa
NGC 2217 SBa(s) (R)S0 4.5 21 34* 11.35 1609 C 110 20 Bettoni et al. 1990
NGC 3081 SBa(s) (R)SAB(r)0 2.1 40 158 12.59 2391 O ... 74 Storchi-Bergmann et al. 1996
NGC 7079 SBa SB0(s)0 2.1 53 82 12.36 2663 G 82 170 Bettoni & Galletta 1997

Sab
NGC 2460 Sab(s) Sa(s) 2.5 42 40 12.29 1442 O 40 130 this paper
NGC 4138 Sab(r) S0+(r) 2.6 50 150 12.10 1039 C 150 60 Jore et al. 1996
NGC 4151 Sab (R')SABab(rs): 6.3 46 50 10.71 995* Z 48 138 Winge et al. 1999
NGC 4388 Sab Sb(s): sp 5.6 83 92 10.79 2538 I 90 0 Rubin et al. 1999
NGC 4450 Sab pec Sab(s) 5.2 43 175 10.75 2048 I 175 85 Rubin et al. 1999
NGC 4569 Sab(s)I-II SABab(rs) 9.6 65 23 9.79 -311 Z 23.5 113.5 Rubin et al. 1999
NGC 4579 Sab(s)II SABb(rs) 5.9 38 95 10.29 1627 O 275 185 Rubin et al. 1999
NGC 4826 Sab(s)II (R)Sab(rs) 10.0 59 115 8.82 474 Z 115 25 Rubin 1994
NGC 7177 Sab(r)II.2 SABab(r) 3.1 51 90 11.47 1112 Z 90 0 Márquez et al. 2002

SBab
NGC 4419 SBab: SBa(s) 3.3 74 133 11.60 -224 O 133 43 Rubin et al. 1999

Sb
NGC 224 SbI-II Sb(s) 190.5 72 35 3.36 -295 I ... 128 Sandqvist et al. 1989
                  38 128 Pellet 1976
                  38 128 Rubin & Ford 1970
NGC 891 Sb on edge Sb(s)? sp 13.5 81 22 9.37 528* Z 22 112 Keppel et al. 1991
NGC 1961 Sb(rs)II pec SABc(rs) 4.6 50 85 11.01 3983 Z 85 175 Rubin et al. 1979
NGC 2841 Sb Sb(r) 8.1 64 147 9.58 635 G 150 62 Sil'chenko et al. 1997
NGC 3031 Sb(r)I-II Sab(s) 26.9 59 157 7.39 -49 G 150 60 Goad 1974
NGC 3504 Sb(s)/SBb(s)I-II (R)SABab(s) 2.7 39 57* 11.65 1518 Z 152 62 Burbidge, et al. 1960
NGC 3521 Sb(s)II-III SABbc(rs) 11.0 63 163 9.29 782 Z 163 73 Zeilinger et al. 2001
NGC 4192 SBII: SABb(s) 9.8 75 155 10.02 -126 I 155 65 Rubin et al. 1999
NGC 4258 Sb(s)II SABbc(s) 18.6 68 150 8.53 480 G 148 58 Chincarini & Walker 1967
                  150 ... Sofue et al. 1999
NGC 4527 RSb(rs)II SABbc(s) 6.2 71 67 10.66 1727 I 67 157 Rubin et al. 1999
NGC 5172 SbI SABbc(rs): 3.3 59 103 12.10 4337 Z 103 13 Márquez et al. 2002
NGC 6810 Sb Sab(s):sp 3.3 78 176 11.49 1958 I 176 86 this paper
NGC 6951 Sb/SBb(rs)I.3 SABbc(rs) 3.9 34 170 10.71 1331 I 138 48 Perez et al. 2000
NGC 7217 Sb(r)II-III (R)Sab(r) 3.9 34 95 10.53 935 G 86 10 Peterson et al. 1978
NGC 7331 Sb(rs)I-II Sb(s) 10.5 70 171 9.38 835 Z 171 77 Rubin et al. 1965

SBb
NGC 1300 SBb(s)I.2 SBbc(rs) 6.2 49 106 10.77 1592 C 103 185 Peterson et al. 1980
NGC 1365 SBb(s)I SBb(s) 11.2 57 32 9.93 1675 G 225 318 Lindblad et al. 1996
NGC 3992 SBb(rs)I SBbc(rs) 7.6 52 68 10.26 1059 O 67 152 Wilke et al. 2000
NGC 4639 SBb(r)II SABbc(rs) 2.8 48 123 11.85 898 C 124 34 Rubin et al. 1999
NGC 5728 SBb(rs)II SABa(r): 3.1 55 30 11.65 2885 C 33 123 Rubin et al. 1980
NGC 5850 SBb(sr)I-II SBb(r) 4.3 30 140 11.39 2483 Z 163 73 Higdon et al. 1980
NGC 6300 SBb(s)II pec SBb(rs) 4.5 49 118 10.20 1064 C 111 21 Buta 1987
NGC 6951 Sb/SBb(rs)I.3 SABbc(rs) 3.9 34 170 10.71 1331 I 138 48 Perez et al. 2000

Sbc
NGC 3310 Sbc(r) pec SABbc(r) pec 3.1 40 ... 10.95 1018 I 150 60 Mulder & van Driel 1996
NGC 4433 SbcIII SABab(s) 2.2 65 5 12.64 2942 G 0 90 Chromey 1974
NGC 4501 Sbc(s)II Sb(rs) 6.9 59 140 9.86 2120 Z 320 210 Rubin et al. 1999
NGC 4580 Sbc(r)II SABs(rs) pec 2.1 40 165 12.49 1227 G 345 255 Rubin et al. 1999
NGC 5194 Sbc(s)I-II SAbc(s) pec 11.2 53 163 8.67 463 I 170 80 Kuno et al. 1997
NGC 5248 Sbc(s)I-II SABbc(rs) 6.2 44 110 10.63 1189 Z 113 23 Burbidge et al. 1962
NGC 6221 Sbc(s)II-III SBc(s) 3.5 47 5 9.77 1350 I 5 95 Vega Beltràn et al. 1998
NGC 6574 Sbc(r)II SABbc(rs): 1.4 40 160 11.79 2321 C 159 66 Demoulin 1969
NGC 6814 Sbc(rs)I-II SABbc(rs) 3.0 21 89* 11.32 1509 Z 90 0 Schulz et al. 1994

SBbc
NGC 2336 SBbc(r)I SABbc(r) 7.1 58 178 10.61 2205 C 5 94 Wilke et al. 1999
NGC 7479 SBbc(s)I-II SBc(s) 4.1 41 25 11.22 2394 I 35 125 Wilke et al. 2000

Sc
NGC 157 Sc(s)II-III SABbc(rs) 4.2 50 30 10.59 1730 Z ... 130 Ryder et al. 1998
                  224 ... Fridman et al. 2001
NGC 253 Sc(s) SABc(s) 27.5 77 52 7.09 240 I 52 321 Prada et al. 1998
NGC 949 Sc(s)III Sb(rs):? 2.4 58 145 11.78 596 I 145 55 this paper
NGC 1084 Sc(s)II.2 Sc(s) 3.2 56 35 10.90 1414 Z 33 123 Burbidge et al. 1963
NGC 1087 Sc(s)III.3 SABc(rs) 3.7 53 5 10.97 1508 Z 0 90 Blackman 1980a
NGC 1792 Sc(s)II SAbc(rs) 5.2 61 137 10.36 1218 Z 140 50 Rubin et al. 1964
NGC 2541 Sc(s)III Scd(s) 6.3 60 165 11.57 628 C 165 75 this paper
NGC 2748 Sc(s)II-III SAbc 3.0 68 38 11.59 1456 G 44 134 Reshetnikov & Combes 1994
NGC 2776 Sc(s)I SABc(rs) 3.0 27 93* 11.96 2618 G 90 0 Carozzi 1979
NGC 2903 ScIII pec SABbc(rs) 12.6 62 17 9.11 565 O 9 103 Walker 1989
NGC 2998 Sc(s)II SABc(rs) 2.9 63 53 12.52 4767 Z 53 143 Rubin et al. 1980
NGC 3079 Sc pec SBc(s) sp 7.9 81 165 10.41 1101 Z 169 79 Veilleux et al. 1999
NGC 3495 Sc(s)III Sd: 4.9 77 20 10.74 1086 Z 20 110 Rubin et al. 1980
NGC 3672 Sc(s)I-II Sc(s) 4.2 63 12 11.41 1857 C 8 98 Rubin et al. 1977
NGC 3684 Sc(s)II Sbc(rs) 3.1 47 130 11.82 1394 Z 128 38 Blackman 1980b
NGC 4100 Sc(s)I-II (R')Sbc(rs) 5.4 72 167 11.05 1131 G ... 78 Afanaz'ev et al. 1992
NGC 4212 Sc(s)II-III Sc: 3.2 52 75 11.35 377 Z 75 165 Rubin et al. 1999
NGC 4237 Sc(r)II.8 SABbc(rs) 2.1 50 108 12.18 865 Z 108 18 Rubin et al. 1999
NGC 4298 Sc(s)III Sc(rs) 3.2 56 140 11.62 1122 I 140 50 Rubin et al. 1999
NGC 4303 Sc(s)I.2 SABbc(rs) 6.5 27 162* 10.12 1607 I 318 228 Rubin et al. 1999
NGC 4321 Sc(s)I SABbc(s) 7.4 32 30 9.98 1579 O 350 260 Rubin et al. 1999
NGC 4420 Sc(s)III SBbc(r): 2.0 62 8 12.28 1711 Z 8 98 Rubin et al. 1999
NGC 4536 Sc(s)I SABbc(rs) 7.6 65 130 10.58 1894 Z ... 40 Afanaz'ev et al. 1992
NGC 4567 Sc(s)II-III Sbc(rs) 3.0 48 85 11.79 2213 I 85 175 Rubin et al. 1999
NGC 4568 Sc(s)II-III Sbc(rs) 4.6 65 23 11.18 2260 Z 23 113 Rubin et al. 1999
NGC 4571 Sc(s)II-III Sd(r) 3.6 27 55 11.73 284 Z 40 130 Rubin et al. 1999
NGC 4595 Sc(s)II.8 SABb(rs)? 1.7 50 110 12.62 589 Z 110 200 Rubin et al. 1999
NGC 4647 Sc(s)III SABc(rs) 2.9 38 125 11.81 1421 O 124 214 Rubin et al. 1999
NGC 4651 Sc(r)I-II Sc(rs) 4.0 49 80 11.04 788 C 71 161 Rubin et al. 1999
NGC 4808 Sc(s)III Scd(s): 2.8 66 127 11.82 738 Z 127 37 Rubin et al. 1999
NGC 4945 Sc SBcd(s): sp 20.0 81 43 7.43 581 G 42 132 Peterson 1980
NGC 5012 Sc(rs)I-II SABc(rs) 2.9 55 10 12.49 2661 Z 10 170 Márquez et al. 2002
NGC 5457 Sc(s)I SABcd(rs) 28.8 21 ... 8.21 221 Z 35 125 Comte et al. 1979
NGC 5480 Sc(s)III Sc(s): 1.7 49 0 12.49 1823 I 177 87 Márquez et al. 2002
NGC 5962 Sc(r)II.3 Sc(r) 3.0 45 110 11.73 1993 C 110 20 Márquez & Moles 1996
NGC 6070 Sc(s)I Scd(s) 3.5 59 62 11.58 2007 I 62 152 Márquez et al. 2002
NGC 6106 Sc(rs)II.3 Sc 2.5 57 140 12.22 1464 Z 140 50 Márquez et al. 2002
NGC 6946 Sc(s)II SABcd(rs) 11.5 32 ... 7.78 7 O 67 157 Munoz Tunon et al. 1987
NGC 7541 Sc(s)II SBbc(rs): pec 3.5 70 102 11.57 2669 Z ... 15 Kyazumov 1980

SBc
NGC 4064 SBc(s): SBa(s): pec 4.4 67 150 11.75 1000 G 150 60 Rubin et al. 1999
NGC 4178 SBc(s)II SBdm(rs) 5.1 70 30 11.35 240 Z 30 120 Rubin et al. 1999
NGC 4294 SBc(s)II-III SBcd(s) 3.2 68 155 11.83 421 Z 155 65 Rubin et al. 1999
NGC 4535 SBc(s)I.3 SABc(s) 7.1 45 0 10.32 1973 C 0 90 Rubin et al. 1999
NGC 4654 SBc(rs)II SABcd(rs) 4.9 55 128 10.75 1035 Z 128 38 Rubin et al. 1999
NGC 4713 Sbc(s)II-III SABd(rs) 2.7 51 100 11.85 631 Z 100 10 Rubin et al. 1999
NGC 7070 SBc(s)II.8 Scd(s) 2.3 39 23* 12.55 2369* Z 29 119 Sharples at al. 1983

Scd
NGC 4490 Scd III pec SBd(s) pec 6.3 61 125 9.81 594 I 125 62 Duval 1981

Sm, Im
NGC 1156 SmIV IBm(s) 3.3 42 25 11.41 372 C 25 115 Hunter et al. 2002
NGC 2366 SBmIV-V IBm(s) 8.1 66 25 10.95 87 I 30 120 Hunter et al. 2002
NGC 4449 SmIV IBm 6.2 45 45 9.94 211 Z 45 135 Hunter et al. 2002

S
NGC 1487 S pec tides pec 3.3 50 55 11.92* 733 G ... 160 Aguero & Paolantonio 1997
NGC 3691 S SBb? 1.3 42 15 12.95 997 Z 191 100 Blackman 1980b
NGC 3955 S pec S0/a pec 2.9 74 165 12.03 1515 G 166 76 Chromery 1974

SB
NGC 4670 SB pec SB0(s): pec 1.4 41 90 12.89 1112 Z 90 0 Sakka et al. 1973
NOTES - Data are taken from RC3 except for those marked with *, which are taken from LEDA. Col.(2): morphological classification from RSA. Col.(3): morphological classification from RC3. Col.(4): major-axis isophotal diameter measured at the surface brightness level $\mu_B$ = 25.0 mag arcsec-2 from RC3. Col.(5): inclination derived as $\cos^{2}{i}~=~(q^2-q_0^2)/(1-q_0^2)$. The observed axial ratio q is taken from RC3 and the intrinsic flattening has been assumed following Guthrie (1992) with RC3 morphological classification. Col.(6): major-axis position angle from RC3. Col.(7): apparent total blue magnitude corrected for inclination, extinction and redshift from RC3. Col.(8): optical recession velocity from RC3. Col.(9): classification of the minor-axis velocity profiles as described in Sect.2. Col.(10): observed position angle which is closest to the galaxy major axis. Col.(11): observed position angle which is closest to the galaxy minor axis. Col.(12): reference for gas kinematics measured along the observed position angles.

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