Table 1. Delta-m Catalog Method Statistics

--------------------------------------------------+--------+--------------+
Method Description                                | Number | Mean Delta-m |
--------------------------------------------------+--------+--------------+
Adaptive Optics                                   |    141 |    1.13      |
Various interferometric techniques*               |    394 |    1.15      |
Tycho photometry                                  |   8600 |    1.32      |
Lunar occultation                                 |    433 |    1.19      |
CCD                                               |    555 |    1.63      |
Photography                                       |   1208 |    1.10      |
Photocell with diaphragm in focal plane           |     93 |    2.20      |
Area scanner                                      |    218 |    1.88      |
Photoelectric photometer                          |    184 |    3.90      |
Focal-grating photometer                          |    143 |    1.94      |
Wedge photometer                                  |   5178 |    2.97      |
Double-image or polarizing photometer             |   1772 |    2.75      |
Visual estimate with double-image micrometer      |    591 |    1.10      |
Visual estimate with objective grating            |     76 |    1.13      | 
--------------------------------------------------+--------+--------------+

* Given in greater detail in catalog.