A method is provided wherein a lithographic projection apparatus is used to print a series of test patterns on a test substrate to measure printed critical dimension as function of exposure dose setting and focus setting. A hollow, cane-shaped spout mounts to the top end and seats a spray head at one end. This method can be utilized to improve productivity and resolve the problem of spreading. One end of the connecting plug is an universal receptacle portion capable of being inserted an universal plug, while another end is a signal inputoutput portion of various type and signal input mode, such as a communication plug, an earphone, a mobile phone hand-free receiver, a USB, an ADSL connectors. When the vehicle operator can see the colored substrate through the selective acceptance layer, which transmits only normal light, the mirror is properly aligned.