A stub directory is written out to a storage device for multiple files in a container file, the stub directory including identifiers of the multiple files but excluding data of the multiple files. The main pole is configured to emit flux and the return pole is configured to return the flux to the main pole. For memory and bandwidth constrained applications, starting points of convergence regions may not be stored but instead calculated at runtime prior to rendering a point on the implicit curve. The RF modulator provides an RF input signal to the RF PA, which receives and amplifies the RF input signal to provide the RF transmit signal. on which a wafer W is mounted to raise the processing gas to plasma, and using the plasma, a contact hole 210 is formed at an SiO2 film 208 on an SiNx film 206 formed at the wafer W.