Technique                       Total|Mean Sep. (as)|Median Sep. (as)
 A  Adaptive Optics                  24471          3.151          1.182 
 C  CCD (long focus)                117739         21.018          8.908 
 D  Heliometer                        1732         31.211         10.525 
 E  Wide-field CCD                  569851         46.124         14.640 
 H  Space-based technique           646678         41.075          8.735 
 I  Interferometry                     907          0.273          0.164 
 J  Visual Interferometer             4181          0.213          0.128 
 K  Long-Baseline Interferometer      5301          0.423          0.047 
 M  Micrometer                      425462         10.257          2.140 
 O  Occultation                       2453          0.577          0.100 
 P  Photography                     186319         33.088         13.349 
 S  Speckle Interferometer          143946          1.223          0.460 
 T  Transit Instrument               10917        145.782         42.040 
 V  Visual Estimate                     62         54.657         12.600 
 X  Spectroscopy                       536         14.060         10.000 
 Z  Photometer                      100027         37.102         19.480 
 -  Unknown                           2399         77.011         13.900