Table 1. Delta-m Catalog Method Statistics 8 July 2013

---------------------------------------------+------+---------+--------------+
Method Description                           | Code |  Number | Mean Delta-m |
---------------------------------------------+------+---------+--------------+
Refractor, micrometer                        |  A   |       0 |      .       |
Comparison image micrometer                  |  C   |       0 |      .       |
Heliometer                                   |  D   |       0 |      .       |
wide field CCD astrometry                    |  E   |       0 |      .       |
CCD astrometry                               |  F   |       5 |     1.10     |
Photographic, with astrograph                |  G   |       3 |     0.21     |
Photographic, medium or long-focus technique |  H   |       5 |     1.71     |
   includes ocular enlargement               |      |         |              |
Visual interferometer, aperture is of largest|  J   |       0 |      .       |
   baseline on the monolithic mirror (e.g.,  |      |         |              |
   Finsen's 26" or 240" on the 20 foot beam  |      |         |              |
   used on the 100")                         |      |         |              |
Long baseline interferometer                 |  K   |       3 |     1.99     |
   aperture is of largest telescope or       |      |         |              |
   siderostat not the baseline.              |      |         |              |
Electronographic camera                      |  L   |       1 |     2.00     |
Meridian circle                              |  M   |     543 |     1.21     |
Visual measures with double-image micrometer |  N   |       0 |      .       |
Lunar Occultation                            |  O   |      49 |     1.93     |
Photoelectric phase-grating interferometer   |  P   |    1217 |     1.10     |
HST (FGS, WFPC, NICMOS, etc.)                |  Q   |       0 |      .       |
micrometer plus comparison image micrometer  |  R   |       0 |      .       |
Speckle interferometry                       |  S   |       5 |     0.98     |
Hipparcos or Tycho type observation          |  T   |       0 |      .       |
Adaptive Optics                              |  U   |       0 |      .       |
Photocell with diaphragm in focal plane      |  V   |       0 |      .       |
Area scanner                                 |  W   |       0 |      .       |
Visual estimate made with objective grating  |  X   |      76 |     1.13     |
Wedge photometer                             |  Y   |       0 |      .       |
double-image or polarizing photometer        |  Z   |    3484 |     2.20     |
---------------------------------------------+------+---------+--------------+
Total                                                    5392       1.83