 Bogen and Woodward (1988) argued that debate on the relationship between theory and observation overlooks a key ingredient in the production of experimental evidence, namely the experimental phenomena. The experimentalists distill experimental phenomena from raw experimental data (e.g. electronic or digital tracks in particle colliders) using various tools of statistical analysis. Thus, identification of an experimental phenomenon as significant (e.g. a peak at a particular energy of colliding beams) is free of the theory that the experiment may be designed to test (e.g. the prediction of a particular particle). Only when significant phenomenon has been identified can a stage of data analysis begin in which the phenomenon is deemed to either support or refute a theory. Thus, the theory-ladenness of evidence thesis fails at least in some experiments in physics.