An adjustable nozzle comprising a nozzle body with an inlet, an outlet and a flow chamber having a smooth bore extending between the inlet and the outlet. In operation, a request is received for a subset of data stored on a client that is required for determining whether the data is unwanted. The SIMD floating-point unit also includes means for generating a first slice and a second slice. An electric potential in which the image signal is offset by the amount of the threshold value is therefore applied to the gate electrode of the TFT.