A light source including a plurality of flash lamps emits flashes thereby flash-heating a semiconductor wafer held by a thermal diffuser and a hot plate. The report can include a modified mean difference plot, a variability chart, confidence intervals for bias and a plot of the intervals. The corrected measurement may be used to estimate intravascular blood volume andor fluid responsiveness of a patient. The method includes accessing a supplemental database to obtain inferred location information corresponding to any identified WLAN-enabled access point. The circuit also includes a second VCO that receives the third voltage signal and which outputs a spread spectrum clock.