An image forming apparatus includes an electrophotographic developing device, a photosensitive body, a precharger for precharging the photosensitive body, and exposing units of two optical systems with different light amount distributions, which are provided for one photosensitive body for forming electrostatic latent images on the photosensitive body. The variety has a light green color deep within the throat, followed by a pure white color throughout the rest of the petals. The modified request can include one or more restrictions added to the original request pertaining to which data will be accessed as a function of the input. An auxiliary feedback loop receives error phase \u03a6E from each of the reference phase \u03a6REF and the feedback phase \u03a6FBK.