**Table B.1:** Observational data for High-Density Tracers based on Pico Veleta and SEST Data and from Literature .
Source		MM	$D_{\rm L}$ ³	$L_{\rm FIR}$	CO (1-0)	CO (2-1)	HCN (1-0)	HNC (1-0)	HCO⁺ (1-0)	CS (3-2)	CN (1-0)	CN (2-1)	Telescopes	Comments
IRAS	name		Mpc	$\log\frac{L_{\rm FIR}}{L_\odot}$	Jy km s^-1	Jy km s^-1	Jy km s^-1	Jy km s^-1	Jy km s^-1	Jy km s^-1	Jy km s^-1	Jy km s^-1
00085-1223	NGC34		82.8	11.47	148.5 (13.5)^d	...	...	<7.5^d	...	...	<8.1^d	10.2 (2.0)^d	SE	-
00278-3331	NGC134		22.0	10.60	336.4 (27.0)	...	<21.0	...	<21.0	<57.2	...	...	SE	-
00335-2732	...	1	293.5	11.94	<26.8	...	<15.4	...	<15.4	<28.9	...	...	SE	-
00345-2945	NGC174		49.3	10.92	211.7 (19.1)	...	<17.6	...	<17.6	<36.0	...	...	SE	-
01053-1746	IC1623		81.7	11.63	291.1 (44.8)	...	10.7^f	...	12.4 (2.0)	...	...	...	SE, KP	scaled value from ref. f
01364-1042	...	1	203.5	11.85	46.5^a	...	<6.9	...	<6.9	<14.1	...	...	SE	-
01403+1323	NGC660		14.0	10.59	716.3 (186.9)	1617.3 (18.4)	33.0 (8.3)	18.9 (5.7)	32.8 (6.3)	<86.0	<8.6	...	PV, SE	SEST data CO
02401-0013	NGC1068	2	16.7	11.18	1902.9^f	1967.2 (82.0)^j	157.5 (12.1)	61.9 (8.8)	143.1 (9.3)	50.5 (6.9)	285.4 (24.2)	...	SE, FC, PV	scaled refs. f &j. PV data
														consist. with refs. c, h & i
03056+2034	...	1	114.1	11.20	94.5	34.7 (4.2)	<1.9	...	...	...	...	...	PV	-
03317-3618	NGC1365		20.8	11.10	2165.9 (102.4)	...	132.6 (65.0)	49.1 (9.6)	87.6 (25.9)	46.7 (9.7)	...	...	SE	SEST data consist. with f
05059-3734	NGC1808		10.9	10.54	1897.6 (137.2)	...	107.1 (5.0)	45.2 (10.5)	59.4 (3.6)	10.1 (3.6)	102.6 (2.7)^d	82.0 (4.1)^d	SE	HNC low in ref. d
05414+5840	...		62.0	11.25	411.1	508.0 (36.6)	14.9 (2.5)	<3.8	9.1 (2.6)	<23.4	11.6	<10.4	PV	-
07160-6215	NGC2369		45.3	11.12	553.8 (5.7)^b	959.4 (14.3)^b	23.8 (8.0)	<13.7	23.8 (6.3)	<20.6	...	...	SE	SEST data & ref. b
08071+0509	...	1	220.1	11.80	70.9	115.4 (7.3)	<3.8	<6.9	...	<5.9	...	<142.4	PV	-
10039-3338	...	1	143.2	11.70	...	...	<9.0	...	<9.0	<13.5	...	...	SE	-
10257-4338	NGC3256		39.3	11.62	1222.8 (7.6)^b	2980.7 (14.3)^b	46.5 (8.8)	<42.0	59.6 (6.7)	<32.7	32.4 (1.4)^d	22.6 (2.0)^d	SE	HCN low in ref. d
11143-7556	NGC3620		25.3	10.92	572.7 (74.3)	...	43.5 (17.6)	<15.6	<23.1	38.4 (8.7)	...	...	SE	-
11257+5850a	Arp299A	1,2	42.0	11.75	283.5	537.8 (5.4)	11.8 (1.8)	4.9 (1.2)	19.2 (1.9)	<10.4	8.6 (2.1)	...	PV	IC694, refs. e & f consist.
														scaled ref. g
11506-3851	...	1	42.8	11.24	225.3^a	...	41.4 (10.5)	<23.1	<13.3	17.6 (4.2)	...	...	SE	-
12018-1852	NGC4038		22.6	10.69	...	...	8.6 (5.2)	<14.6	26.8 (6.9)	<19.6	...	...	SE	-
12243-0036	...	1	30.3	10.97	165.4	253.3 (3.0)	13.0 (1.6)	13.4 (1.6)	9.7 (1.6)	15.9 (2.5)	9.4 (1.8)	<16.1	PV	-
12540+5708	Mrk231	1	170.0	12.35	103.5^g	...	17.6^g	12.1 (2.4)^d	12.6 (1.5)	...	13.3 (5.3)^d	4.0 (1.1)	OSO, PV	agrees with our data
13126+2452	...		54.3	11.14	236.2	131.8 (2.0)	<2.8	<5.8	4.8 (1.1)	<6.2	...	3.1 (1.0)	PV	-
13341-2936	M83⁴		3.7	10.07	653.9 (33.3)	...	68.4 (21.2)	20.1 (1.4)^c	30.8 (12.5)	5.5 (1.4)ⁱ	...	...	SE, PV	-
13428+5608	Mrk273	1	152.0	12.12	97.3^g	...	15.6^g	<6.1^d	5.9^g	...	<6.7^d	...	OSO	refs. g & c consist.
14566-1629	...		48.6	10.64	<24.9	...	...	...	...	<15.8	...	...	SE	-
15065-1107	...	1	25.3	10.35	207.9	28.6 (3.3)	3.5 (1.1)	...	...	<3.4	...	...	PV	-
15107+0724	...	1	47.1	11.14	118.1	356.3 (4.6)	13.0 (3.6)	6.9 (4.3)	6.5 (2.2)	11.7 (3.4)	7.6 (9.8)	<27.4	PV	-
15327+2340	Arp220	1	73.0	12.16	515.0^e	650.9 (32.4)	39.8^e	34.8 (7.3)^d	18.5 (3.6)	57.6 (12.9)	68.7 (10.3)^d	39.1 (12.0)^d	PV, OSO, SE	scaled values refs. f & e
16399-0937	...	1	111.1	11.50	118.1	67.4 (9.2)	<2.7	...	...	...	...	...	PV	-
16504+0228	NGC6240	2	98.0	11.76	333.2^g	457.0 (12.5)	31.2^g	8.0 (4.0)^d	23.4^g	<26.3	15.1 (2.1)^d	42.4 (3.3)^d	SE, PV	scaled values ref. g
														ref. e consist.
17208-0014	...	1	173.0	12.40	177.7^g	327.0 (3.7)	12.8^g	...	8.7^g	...	<15.9	<6.8	PV	-
17526+3253	...	1	106.9	11.10	104.0	164.6 (14.4)	<3.6	<8.1	<6.9	<8.8	...	<26.3	PV	-
20550+1656	...	1	152.7	11.86	80.3	111.8 (4.1)	2.8 (1.2)	...	...	...	...	...	PV	-
22025+4205	...	1	60.3	11.00	89.8	142.9 (60.0)	13.6 (2.2)	<6.9	5.7 (1.8)	...	<5.2	<8.2	PV	-
23134-4251	NGC7552		22.1	11.02	652.0 (88.1)	...	34.3 (6.4)	16.1 (5.2)	30.8 (6.5)	22.2 (4.5)	...	...	SE	-
23156-4238	NGC7582		21.9	10.87	695.5 (69.0)	...	21.2 (5.8)	<26.1	28.3 (10.3)	<23.4	...	...	SE	-
00402-2350	...		95.0	11.44	209.8 (5.7)^b	323.9 (8.2)^b	...	...	...	...	...	...	SE	-
00450-2533	NGC253⁴		2.5	10.22	8236.0^f	...	318.2 (14.0)^h	234.0 (7.0)^c	276.1 (14.0)^h	128.5 (12.5)ⁱ	553.3 (43.5)^c	412.2 (15.1)^l	PV, KP	scaled values ref. f
01077-1707	...		140.6	11.61	120.0^a	...	...	...	...	...	...	...	SE	-
01159-4443	...	1	95.7	11.36	107.8^a	...	...	...	...	...	...	...	SE	-
01219+0331	NGC520		31.6	10.96	226.8^e	...	15.9^e	...	...	...	...	...	PV	-
01484+2220	NGC695		131.0	11.60	27.3^g	...	2.3^g	...	3.6^g	...	...	...	PV	-
02071+3857	NGC828		74.6	11.33	378.0^e	...	<3.7^e	...	...	...	...	...	PV	-
02114+0456	Mrk1027		123.0	11.37	136.0^f	...	4.4^f	...	...	...	...	...	PV	-
02193+4207	NGC891		10.0	10.38	494.3^f	381.6 (26.6)^j	8.4 (2.3)^h	4.2 (0.9)^c	9.4 (3.7)^h	...	...	...	PV, FC	scaled values ref. f
														consist. with c & h
02360-0653	NGC1022		21.1	10.39	337.7^f	...	9.4^f	...	...	...	...	...	KP	-
02381+5923	Maffei2		5.0	10.00	...	...	123.5 (9.4)^h	34.2 (1.9)^c	45.9 (6.1)^h	28.2 (2.3)ⁱ	...	...	PV	-
02391+0013	NGC1055		14.8	10.29	2221.4^f	2630.2 (136.0)^j	<31.3^f	...	...	...	...	...	KP, PV	scaled values ref. j
02526-0023	NGC1144		118.0	11.39	216.9^f	...	3.5^f	...	...	...	...	...	PV	-
03419+6756	IC342⁴		3.7	9.92	3247.2^f	...	89.4 (5.2)^h	29.9 (0.9)^c	45.9 (4.7)^h	22.2 (3.2)ⁱ	71.3 (4.7)^m	23.1 (0.9)^c	PV, KP	scaled values ref. f
04170+7510	NGC1530		34.8	10.64	269.3^e	...	9.4^e	...	...	...	...	...	PV	-
04315-0840	NGC1614		63.3	11.52	243.0 (13.5)^c	...	7.2^f	...	...	...	16.2 (8.1)^d	20.5 (4.1)^d	SE, PV	-
04454-4838	...	1	224.4	11.86	29.4^a	...	...	...	...	...	...	...	SE	-
05083+7936	VIIZw31		220.0	11.92	100.9^g	...	4.9^g	...	3.5^g	...	...	...	PV	refs. f & g not consist.
05189-2524	...		167.5	11.96	92.4^f	...	5.3^f	...	...	...	...	...	PV	-
06035-7102	...		335.2	12.18	31.8^a	...	...	...	...	...	...	...	SE	-
06106+7822	NGC2146		15.2	10.97	1146.4 (26.7)^e	1259.0 (17.3)^j	<18.7^h	7.5 (1.4)^c	19.7 (3.3)^h	<9.2ⁱ	32.0 (8.0)^d	...	OSO, PV	scaled values ref. j
06206-6315	...	1	390.3	12.20	51.4^a	...	...	...	...	...	...	...	SE	-
06259-4708	...		165.5	11.83	71.8 (1.9)^b	174.2 (6.2)^b	...	...	...	...	...	...	SE	-
06592-6313	...		96.1	11.16	83.3^a	...	...	...	...	...	...	...	SE	-
07101+8550	NGC2276		35.5	10.77	292.6^f	...	6.8^f	...	...	...	...	...	KP	-
08354+2555	NGC2623		76.7	11.56	346.6 (13.3)^d	...	...	14.5 (3.6)^d	...	...	<16.0^d	...	OSO	-
08520-6850	...		191.8	11.73	26.9^a	...	...	...	...	...	...	...	SE	-
09111-1007	...		231.4	12.03	56.3^a	...	...	...	...	...	...	...	SE	-
09126+4432	Arp55		161.0	11.68	48.3^g	...	4.7^g	...	3.9^g	...	...	...	PV	ref. f & h not consist.
09293+2143	NGC2903		6.2	9.89	1162.5^f	...	28.1 (5.6)^h	6.5 (1.4)^c	10.3 (2.8)^h	...	...	...	PV	scaled values ref. f
09320+6134	UGC5101	1	160.2	11.96	73.3^f	...	10.4^f	...	...	...	...	...	PV	-
09517+6954	M82⁴		3.5	10.65	4579.6^f	...	118.9 (9.4)^h	62.7 (2.8)^c	188.1 (7.0)^h	75.3 (11.6)ⁿ	165.8 (17.5)^m	88.7 (4.9)^c	PV, KP	scaled values ref. f
09585+5555	NGC3079	2	16.2	10.64	1768.7^f	...	43.1 (8.9)^h	32.3 (4.7)^c	<9.4^h	15.3 (3.2)ⁱ	...	...	PV, KP	scaled values ref. f
10126+7339	NGC3147		41.6	10.79	75.6^e	...	8.4^e	...	...	...	...	...	PV	-
10565+2448	...		173.3	11.99	77.5^f	...	8.6^f	...	...	...	...	...	PV	-
11010+4107	Arp148	1	143.3	11.59	86.0^f	...	5.4^f	...	...	...	...	...	PV	-
11085+5556	NGC3556		10.6	10.11	1032.5^f	...	16.8^f	...	...	...	...	...	KP	-
11176+1315	NGC3627		7.6	10.10	4477.4^f	3597.2 (74.8)^j	<21.4^f	...	...	...	...	...	KP, PV	scaled values ref. j
11176+1351	NGC3628		9.6	10.21	1309.4^f	1343.1 (17.0)^j	27.1 (6.5)^h	15.9 (1.9)^c	16.9 (2.8)^h	...	...	...	PV, KP	scaled values refs. f & j
11257+5850bc	Arp299bc		42.0	11.59	293.3 (26.7)^d	...	14.0^e	...	11.1^g	...	40.0 (8.0)^d	...	OSO, PV	NGC3690, ref e consist.
11460+4859	NGC3893		13.9	10.02	626.5^f	...	26.0^f	...	...	...	...	...	KP	-
11578-0049	NGC4030		17.1	10.31	1879.9^f	...	39.3^f	...	...	...	...	...	KP	-
11596+6224	NGC4041		18.0	10.19	433.6^f	...	11.7^f	...	...	...	...	...	KP	-
12112+0305	...	1	297.0	12.28	47.8^g	...	3.6^g	...	2.1^g	...	...	...	PV	-
12239+3129	NGC4414		9.3	9.95	1982.0^f	1501.9 (68.6)^j	38.5^f	...	...	...	...	...	KP, PV	scaled values ref. j
12396+3249	NGC4631		8.1	10.25	1167.0^f	...	<27.1^f	...	...	<4.6ⁱ	...	...	KP, PV	-
12542+2157	NGC4826		4.7	9.44	2172.6^f	...	<40.1^f	...	...	...	...	...	KP	-
13001-2339	...		90.0	11.45	142.0^a	...	...	...	...	...	...	...	SE	-
13025-4911	NGC4945		7.8	11.10	9886.6 (28.4)^k	18878.5 (12.3)^k	420.0 (7.5)^k	225.0 (4.1)^k	450.0 (3.8)^k	275.2 (4.0)^k	756.0 (18.9)^k	602.7 (8.0)^k	SE	-
13086+3719	NGC5005		14.0	10.22	2542.3^f	...	75.4^f	...	...	...	...	...	KP	-
13135+4217	NGC5055		7.3	9.96	4690.5^f	...	<46.5^f	...	...	...	...	...	KP	-
13183+3423	Arp193		94.0	11.63	171.1^g	...	4.9^g	...	9.4^g	...	...	...	PV	ref. f & e not consist.
13229-2934	NGC5135		51.7	11.15	426.3^f	...	21.2^f	...	...	...	...	...	KP	-
13299+4713	M51⁴		9.7	11.32	...	...	27.1 (2.3)^h	8.0 (2.3)^c	...	<2.3ⁱ	...	...	PV	-
14306+5808	NGC5678		27.8	10.44	811.7^f	...	23.1^f	...	...	...	...	...	KP	-
14348-1447	...		349.5	12.33	41.6^a	...	...	...	...	...	...	...	SE	-
14376-0004	NGC5713		24.0	10.58	505.9^f	...	10.0^f	...	...	...	...	...	KP	-
14378-3651	...		286.2	12.17	24.5^a	...	...	...	...	...	...	...	SE	-
14514+0344	NGC5775		21.3	10.57	868.7^f	...	26.5^f	...	...	...	...	...	KP	-
16330-6820	...		197.8	11.93	178.8^a	...	...	...	...	...	...	...	SE	-
18093-5744	...		72.5	11.47	146.9^a	...	...	...	...	...	...	...	SE	-
18293-3413	...		72.1	11.73	686.1 (7.6)^b	1426.8 (20.5)^b	18.7^f	...	...	...	...	...	SE, KP	scaled values ref. f
18341-5732	...		64.8	11.26	257.0 (3.8)^b	307.5 (12.3)^b	...	...	...	...	...	...	SE	-
18425+6036	NGC6701		56.8	11.02	380.9^f	...	9.0^f	...	...	...	...	...	KP	-
19115-2124	...		205.3	11.89	95.5^a	...	...	...	...	...	...	...	SE	-
19254-7245	...		260.8	11.96	58.8^a	...	...	...	...	...	...	...	SE	-
20284+2543	NGC6921		75.5	11.06	182.0^f	...	16.5^f	...	...	...	...	...	KP	-
20338+5958	NGC6946		5.5	10.13	1432.2^f	...	41.2 (4.2)^h	18.7 (1.4)^c	45.9 (5.6)^h	8.8 (3.7)ⁱ	...	...	PV, KP	scaled values ref. f
20511-4250	...		179.2	12.00	75.9^a	...	...	...	...	...	...	...	SE	-
21453-3511	NGC7130		65.0	11.31	256.5 (13.5)^d	...	16.5^f	10.0 (1.2)^d	...	...	13.5 (2.7)^d	18.4 (2.0)^d	SE, KP	-
22132-3705	IC5179		48.1	11.15	287.3 (5.7)^b	401.8 (12.3)^b	23.9^f	...	...	...	...	...	SE, KP	scaled values ref. f
22347+3409	NGC7331		15.0	10.56	<191.6^f	...	4.7 (1.4)^h	4.7 (0.9)^c	<2.8^h	...	...	...	PV, KP	scaled values ref. f
22467-4906	...		174.7	11.76	53.9^a	...	...	...	...	...	...	...	SE	-
22491-1808	...	1	329.8	12.16	22.0^a	...	...	...	...	...	...	...	SE	-
23007+0836	NGC7469		66.0	11.51	48.1^g	...	10.8^g	17.0 (2.4)^d	15.8^g	...	21.3 (2.7)^d	...	PV, OSO	-
23024+1203	NGC7479		35.2	10.76	<787.6^f	...	<20.2^f	...	...	...	...	...	KP	-
23128-5919	...		186.3	11.98	46.5^a	...	...	...	...	...	...	...	SE	-
23179-6929	...		174.7	11.72	94.5 (1.9)^b	129.2 (12.3)^b	...	...	...	...	...	...	SE	-
23365+3604	...	1	261.0	12.13	42.1^g	...	2.3^g	...	1.4^g	...	...	...	PV	refs. f & g not consist.
23488+1949	NGC7771		57.0	11.32	496.1^g	...	22.7^g	...	21.5^g	...	...	...	PV	refs. f & e consist.
23488+2018	Mrk331		72.0	11.40	49.5^g	...	8.3^g	...	10.5^g	...	...	...	PV	refs. f & g not consist.

Notes to Table 1: 1) Data without references is new data presented in this paper. References for line data from the literature: a Mirabel et al. (1990), b Garay et al. (1993), c Hüttemeister et al. (1995),

d Aalto et al. (2002), e Solomon et al. (1992), f Gao & Solomon (2004a), g Graciá-Carpio et al. (2006), h Nguyen-Q-Rieu et al. (1992), i Mauersberger et al. (1989), j Braine & Combes (1992), k Wang et al. (2004),

l Henkel et al. (1993), m Henkel et al. (1988), and n Mauersberger & Henkel (1989).

2) Column MM: 1 = OH MM, 2 = H₂O MM.

3) Distances $D_{\rm L}$ derived from radial velocities using H₀ = 72 Mpc/ ${\rm km~s}^{-1}$ and q₀ = 0.5.

4) Observational data from the literature for M 51, M 82, M 83, IC 342, NGC 253, and Maffei 2 were taken at the nuclear position using the 26" beam of the IRAM 30m telescope.

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