Table 2: Previous CO observations of M 83 divided into two groups: single-dish and interferometer observations. If no location is given, the map is centered on the nucleus and oriented along the major axis.
Reference Transition Beam and telescope Map description
Combes et al. (1978) CO(1-0) 64 $^{\prime \prime }$, NRAO 11 m 10 positions, 6$^\prime$ $\times$ 3$^\prime$
Lord (1987) CO(1-0) 45 $^{\prime \prime }$, FCRAO 14 m 21 positions, 5$^\prime$ $\times$ 5$^\prime$
Wiklind et al. (1990) CO(1-0) 45 $^{\prime \prime }$, SEST 15 m 196 positions, SE quadrant, 3$^\prime$ $\times$ 2$^\prime$
  CO(2-1) 23 $^{\prime \prime }$, SEST 15 m 143 positions, SE quadrant, 1 $.\mkern-4mu^\prime$5 $\times$ 1 $.\mkern-4mu^\prime$5
Handa et al. (1990) CO(1-0) 16 $^{\prime \prime }$, NRO 45 m 85 positions, 3 $.\mkern-4mu^\prime$5 $\times$ 1$^\prime$
Wall (1991) CO(2-1) 22 $^{\prime \prime }$, JCMT 15 m 43 positions
  CO(3-2) 22 $^{\prime \prime }$, CSO 10 m 8 positions
Petitpas & Wilson (1998) CO(3-2) 14 $^{\prime \prime }$, JCMT 15 m 81 positions, 0 $.\mkern-4mu^\prime$7 $\times$ 0 $.\mkern-4mu^\prime$7
  CO(4-3) 12 $^{\prime \prime }$, JCMT 15 m 46 positions, 0 $.\mkern-4mu^\prime$7 $\times$ 0 $.\mkern-4mu^\prime$5
Israel & Baas (2001) CO(2-1) 21 $^{\prime \prime }$, JCMT 15 m 49 positions, 1 $.\mkern-4mu^\prime$2 $\times$ 2 $.\mkern-4mu^\prime$0
  CO(3-2) 14 $^{\prime \prime }$, JCMT 15 m 55 positions, 1 $.\mkern-4mu^\prime$2 $\times$ 1 $.\mkern-4mu^\prime$7
  CO(4-3) 11 $^{\prime \prime }$, JCMT 15 m 20 positions, 0 $.\mkern-4mu^\prime$5 $\times$ 0 $.\mkern-4mu^\prime$5
Crosthwaite et al. (2002) CO(1-0) 55 $^{\prime \prime }$, NRAO 12 m On-the-fly, $10\hbox{$^\prime$ }\times10\hbox{$^\prime$ }$
  CO(2-1) 28 $^{\prime \prime }$, NRAO 12 m On-the-fly, $8\hbox{$^\prime$ }\times8\hbox{$^\prime$ }$
Thuma et al. (in prep.) CO(3-2) 23 $^{\prime \prime }$, SMT 10 m 374 positions, $5\hbox{$.\mkern-4mu^\prime$ }5\times2\hbox{$.\mkern-4mu^\prime$ }5 $
  CO(4-3) 17 $^{\prime \prime }$, SMT 10 m 21 positions
This paper CO(1-0) 45 $^{\prime \prime }$, SEST 15 m 1900 positions, 10$^\prime$ $\times$ 10$^\prime$
  CO(2-1) 23 $^{\prime \prime }$, SEST 15 m 2574 positions, 10$^\prime$ $\times$ 10$^\prime$

Lord & Kenney (1991)

 CO(1-0) 12 $.\!\!^{\prime\prime}$4 $\times$ 5 $.\!\!^{\prime\prime}$4, OVRO Inner eastern arm, 1 $.\mkern-4mu^\prime$5 $\times$ 1 $.\mkern-4mu^\prime$5
Kenney & Lord (1991) CO(1-0) 8 $.\!\!^{\prime\prime}$9 $\times$ 5 $.\!\!^{\prime\prime}$8, OVRO Western bar end, 1 $.\mkern-4mu^\prime$5 $\times$ 1 $.\mkern-4mu^\prime$5
Handa et al. (1994) CO(1-0) 12 $^{\prime \prime }$ $\times$ 6 $^{\prime \prime }$, NMA Nucleus, 1 $.\mkern-4mu^\prime$1 $\times$ 1 $.\mkern-4mu^\prime$1
Rand et al. (1999) CO(1-0) 6 $.\!\!^{\prime\prime}$5 $\times$ 3 $.\!\!^{\prime\prime}$5, OVRO Inner eastern arm, 2 $.\mkern-4mu^\prime$9 $\times$ 1 $.\mkern-4mu^\prime$1


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