A liquid-ejecting head includes a pressure-generating chamber communicating with a nozzle opening, and a piezoelectric element. The valve bridge is engaged with a plurality of valves. The control of the critical race is accomplished by adjusting the relative delay of the individual sections of one or more loops. If no lesions, or stenotic vessels, are identified after the first MR image, the second MR image need not be obtained. Stakes are placed into the soil at predetermined distances from one another and from plants, and twine is attached to stakes along the length that is corrugated or otherwise suitably shaped. The direction of the wind is sensed by the controller through a comparison of relative sizes of waveforms of each primary indirect signal and each secondary indirect signal.