:param list planes: List of PlaneResponse objects.
:param list axis: A normalized 3-vector giving direction of axis
(anti)parallel to nominal drift direction.
:param float origin: location along the X-axis where drift paths
begin (see PlaneResponse.location).
:param float tstart: the time at which drift paths are considered
to begin.
:param float period: the sampling period of the field response.
:param float speed: the nominal drift speed used in the
calculation.
Definition at line 43 of file schema.py.