Data example for the 2003 August 4 event. The traces show final receiver functions computed from records of broad-band station RF48 (bottom) and of two short period stations, one of which located in the back arc (RF59, middle) and the other one placed in the fore arc region (RF09, top). A 5 Hz lowpass filter is applied to avoid aliasing effects caused by resampling. Comparison of the waveforms demonstrates the different frequency contents. As the PC profile is much shorter, we only show stations from the RF profile.