Open Access
Table 1.
Details of samples we adopted in three surveys, including redshift ranges, sample sizes, Dec. ranges, and sky areas.
| Survey | z | Sample size | Dec range | Sky area (deg2) |
|---|---|---|---|---|
| HIPASS | 0 < z < 0.042 | 3079 | −90° < Dec < −6.5° | 18 291 |
| ALFALFA | 0 < z < 0.05 | 18 713 | 0° < Dec < 30° | 5649 |
| FASHI north | 0 < z < 0.05 | 16 879 | 300° < Dec < 66° | 5942 |
| FASHI south | 0 < z < 0.05 | 2720 | −6° < Dec < 0° | 1646 |
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