A liquid discharge device includes a platen, a head unit and an air blower. A resultant combined or selected bias estimate may then be used to compensate the biased output of the sensor in, e. The method compares a sequence of data over an additional calibrationspare path relative to a matched sequence of data being passed on one of the multiple paths. The outer coating region comprises at least one layer of tribological coating material. Printout can start before a mask is done, going columnwise in each swath.