Measurement of polarized light interactions via the Mueller matrix: errata.

No significance should be attached to the fact that the symbols S, F, and ψ sometimes appear in boldface type and sometimes do not. The factor limiting the accuracy of the instrument was the effect of residual retardance in MOD 2 and MOD 3. Since the original paper was submitted, we have replaced MOD 2 with an Inrad 102-020 longitudinal field Pockels cell. An absolute accuracy of better than 2% is now easily achieved. New re­ sults will be published in the near future.