A retardation film containing a polyalcohol ester, a polycarboxylic acid ester, and a cellulose ester, wherein a total acylation degree of the cellulose ester is in the range of 2. The exhaust gas system comprises a device for injecting a further fluid, in particular a water-urea mixture or a liquid fuel, into the pipe section. The method stores in each of the first sequence of modules a skip value representing which of subsequent modules to execute. In accordance with the result of determination, a printable period is updated, and the updated printable period is compared with time necessary for the next print scanning upon completion of one print scanning by reciprocate scanning. The LED lighting system can utilize feed forward control to concurrently modify power demand by the LED lighting power system and power demand of one or more LEDs.