1. A method comprising: receiving first data indicative of pressure measurements and measurements of components of a particle motion vector acquired by sensors disposed on at least one cable; processing the first data on a machine to construct an in-line component of the particle motion vector based on the first data to generate second data, the in-line component being associated with a direction in which the cable extends; and processing the first and second data in a geophysical processing operation that relies on at least three components of the particle motion vector.