A wavefield separation method and apparatus for 3D VSP data, which handles arbitrary 3D source and receiver geometries, and common shot 3C data oriented to North, East and Vertical geographical coordinates and makes use of anisotropic medium properties at the downhole receivers. The present invention enables a merchant to send a signature request over a network to any device having a browser and touch screen or other means for receiving user input. The first, second, andor third models are combined, and the product recovery prediction model is generated based on the combined first, second, andor third models and on the training product recovery data. The combiner is oriented with respect to a mechanical angle.