7.3 Frequency Distribution of Diameters
Table 6 gives the distribution of major diameters of groups and clouds or clusters.
| D(Mpc) | 0.0 | 0.5 | 1.0 | 1.5 | 2.0 | 2.5 | 3.0 | 3.5 | 4.0 | Mean |
| 38 groups* | 2 | 8 | 8 | 17 | 3 | 1.5 | ||||
| 17 clouds and clusters | 6 | 5 | 3 | 1 | 2 | 2.5 | ||||
* Including Local Group.
Median and mean diameters are: groups, 1.5/1.5 Mpc (range 0.3-2.5); clouds and clusters, 2.3/2.5 Mpc (range 1.8-3.6). There is a suggestion of bimodal distributions: small groups (0.3-1.2 Mpc), large groups (1.4-2.5 Mpc); small clouds or clusters (1.8-2.5 Mpc), large clouds (2.8-3.6 Mpc).