In case of disposing a pilot symbol in data transmission which depends on a DWMC transmission system, in a plurality of transmission symbols on a time axis, a pilot symbol, which becomes a signal of a sine wave, is configured, by giving contiguous identical data in a plurality of predetermined symbols. The collar may include an opening that communicates with the interior of said bag and at least one panel that is movable to selectively obscure the opening. To reduce the global unflatness of the patterning array assembly that is oriented in a first plane, the position of at least one substrate of a patterning array is adjusted to a second orientation.