WDS Catalog Method Statistics

---------------------------------------------+------+---------+---------+
Method Description                           | Code |  Number |Mean Sep |
---------------------------------------------+------+---------+---------+
Refractor, micrometer                        |  A   | 342,295 |  8.08   |
Reflector, micrometer                        |  B   |  34,672 |  6.24   |
Comparison image micrometer                  |  C   |   5,105 |  2.21   |
Heliometer                                   |  D   |     494 | 48.31   |
Visual interferometer                        |  E   |   2,880 |  0.17   |
CCD astrometry                               |  F   |   8,167 | 15.46   |
Photographic, with astrograph                |  G   |  62,118 | 21.62   |
Photographic, medium or long-focus technique |  H   |  35,030 | 21.44   |
Transit method                               |  I   |     178 | 50.44   |
Occultation binary                           |  J   |      23 |  4.46   |
Long baseline interferometer                 |  K   |     562 |  0.12   |
Electronographic camera                      |  L   |      91 |  1.59   |
Meridian circle                              |  M   |   7,403 | 34.22   |
Visual measures with double-image micrometer |  N   |       0 |         |
Photographic, with ocular enlargement        |  O   |     418 |  2.93   |
Photoelectric phase-grating interferometer   |  P   |     785 |  0.22   |
HST (FGS, WFPC, NICMOS, etc.).               |  Q   |   1,309 |  1.06   |
RGO micrometer & comparison image micrometer |  R   |     290 |  2.67   |
Speckle interferometry                       |  S   |  35,069 |  0.92   |
Hipparcos or Tycho                           |  T   |  51,444 | 11.17   |
Adaptive Optics                              |  U   |     317 |  2.43   |
Photocell with diaphragm in focal plane      |  V   |       0 |         |
Area scanner                                 |  W   |     172 |  4.71   |
Visual estimate made with objective grating  |  X   |       0 |         |
Wedge photometer                             |  Y   |       0 |         |
Double-image or polarizing photometer        |  Z   |       0 |         |
---------------------------------------------+------+---------+---------+