There is provided an image processing device which converts multi-gradation pixels configuring a multi-gradation image of image data to be used in a color image forming apparatus, into unit dither patterns. The wind guides include at least two parallel wind deflection plates, displaced along parallel direction with respect to each other. In operation, heat is transferred by the heat exchange assembly from the system coolant to a facility coolant, and the frame with the associated bulk power assembly and associated heat exchange assembly provides both power and cooling to the electronics rack. With the device, the lens is identifiable as being defective if the pattern appears as a moir\xe9 distortion in the area when viewed through the lens. The net present value of a structured cash flow may be substantially zero, and may correspond to a maximum notional amount, a maximum flow, or a minimum cut. The invention also concerns pyrogen-free assay systems coated with pyrogen-free antibodies for use in these tests.