In the current invention, a method and apparatus for efficiently deleting large files is described. Resource vectors are used at issue time to redirect instructions, from threads being processed simultaneously, to shared resources for which the multiple threads are competing. The bias field is deduced from the digital image representation of the diagnostic radiation image. The process can be used, for example, to form a waveguide structure having both ridge and channel configurations, or a waveguide and a salicide heater structure, all achieved using the same hardmask. The invention also relates to pharmaceutical compositions comprising these compounds, methods of using these compounds in the treatment of various diseases and disorders, processes for preparing these compounds and intermediates useful in these processes.