020   1  Cluster in Strubble & Rood 1991. 
021   2  Identified as galaxy MS 0122.9+0129 in Maccacaro et al. 1994, extended from ROSAT HRI and PSPC pointed observations; 
021   2  many small galaxies nearby; z measured from three galaxies. 
023   3  Central galaxy is radio source (Brinkman, Siebert, & Boller 1994), z measured from three galaxies. 
025   4  X-ray emission slightly elongated toward cluster A3016. 
026   5  Source at low z (measured on two galaxies), but pointlike; several other objects in the vicinity; could be a group 
026   5  or a single galaxy; uncertain identification. 
027   6  Extended in HRI observation, z measured from two galaxies, RASS data slightly elongated toward a pointlike source 
027   6  at 02{h} 32{m} 37.5{s} - 44{deg} 21' 51'' (J2000). 
034   7  Double-peaked X-ray emission; SRT count rate underestimated because the RASS ML position is centered on one 
034   7  peak; 0.61{+/-}0.01 counts s^-1^ hard count rate from PSPC pointed observations. 
039   8  Extended in HRI observation; identified as normal galaxy in Einstein Catalog IPC Slew Survey, but is a cluster 
039   8  (four galaxies with consistent z). 
040   9  Extended in H RI observation, paired with IC 366 at 3.2', flagged as a nearby gala xy group in the Lyon-Meudon 
040   9  catalog (Garcia 1993) on the basis of a percolation method; z available only for central galaxy, NGC 1550. 
044  10  Normal galaxy, NGC 1650, in a rich field, likely a galaxy group; only one z available. 
048  11  z measured from four galaxies. 
052  12  Cluster behind star HD 3749 3 (spectral type K0, m_V_=8.2), which could only slightly contribute to the X-ray emission 
052  12  (see Maccacaro et al.  1988); the extende d X-ray emission implies that most of the emission comes from the cluster. 
058  13  Unconfirmed cluster with no spectroscopic information available. 
059  14  Elongated X-ray emission between two bright galaxies; SRT count rate in agreement with hard count rate from PSPC 
059  14  pointed observation. 
060  15  Extended in HRI observation. 
062  16  Also A3389 (optical position at 3.3' from X-ray peak), double-peaked X-ray emission centered on NGC 2235 (at 0.7'). 
063  17  Double-peaked X-ray emission, RASS ML position centered on one peak, 0.27{+/-}0.01 counts s^-1^ hard count rate 
063  17  from PSPC pointed observation. 
065  18  Double-peaked X-ray emission, RASS ML position centered on one peak, 1.16{+/-}0.03 counts s^-1^ hard count rate 
065  18  from PSPC pointed observation. 
069  19  Extended in HRI observation, classified as a galaxy cluster in Tucker, Tananbaum, & Remillard 1995. 
074  20  Probable cluster, with only one z measured. 
076  21  Central galaxy is a radio source (Brinkman, Siebert, & Boller 1994; Douglas et al. 1996), z measured from two galaxies. 
082  22  Extended in HRI observation, probable group; z only from the brightest galaxy. 
085  23  Extended in HRI observation, no spectroscopic information available. 
086  24  Unidentified candidate, with no spectroscopic information available. 
107  25  z measured from five galaxies. 
108  26  MS 2215.70404 (coincident with RASS ML emission peak) and MS 2216.00401 are two separate sources, probably parts of 
108  26  the extended X-ray emission from a single cluster (Gioia & Luppino 1994). 
110  27  Extended in HRI observation, only one z measured.  
121  28  Probable cluster, no spectroscopic information available. 
123  29  Extended in HRI o bservation, paired with NGC 7556, z measured from two galaxies. 
125  30  Extended in HRI observation. 
128  31  Extended in HRI observation.