A method of correcting optical coherence tomography image data obtained from a layered media sample includes identifying at least one interface from the obtained OCT data and correcting the OCT data for distortion at the at least one interface. Where the article is irregular, such as in marginal areas, thermodynamic modelling is performed to establish a hypothetic coolingheating pattern for an unflawed article. The spectrums on the distribution trunks are connected to zones of the viewer community which have been selected for market research purposes on the basis of demographics.