Method and apparatus for setting optical imaging properties using radiation treatment, specifically a method and an apparatus for setting the imaging properties of an optical system with radiation treatment of at least one optical element of the optical system in the installed state, and a method for setting the imaging properties of an internal optical element with radiation treatment. In one aspect, a list associated with a first station is generated or stored, the list comprising zero or more identifiers, each identifier identifying one of a plurality of second stations for sending a message to the first station. Also provided is a method of preparing a pharmaceutical composition. A panel assembly connected to the legs proximate the lower ends thereof extends therebetween and provides lateral reinforcement for the legs to increase the carrying capacity of the stool and may include a pocket for small articles. Precharging of integrator output in so called pre-run mode minimizes integrator leakage and non-ideal effects by connecting a Gm in pre-run mode either to input voltage or to a reference voltage depending this Gm is being used in a following clock period.