EXPERIMENTAL METHODS:

E - measurements in emission (arc, furnace, discharge tube, shock tube, etc.).

A - measurements in absorption (King furnace, absorption tube, etc.).

L - lifetime measurements (including Hanle effect).

M - miscellaneous experimental methods (for example, Stark effect, astrophysical measurements, etc.).

OTHER:

CP - data compilation.

R - relative (non-absolute) been determined.

F - data on forbidden (i.e. other than electric dipole) transitions have been determined.