Get instrument response in SAC Poles and Zeros format. SAC PZ is a compact text format containing just the essential components of an instrument response: poles, zeros, and normalization constants. This is simpler than the full RESP format and is often preferred when you only need the basic response information for deconvolution. Returns the poles and zeros that define the frequency response of the seismometer and digitizer system. Use this when you need instrument response information in a format that's easy to parse and directly usable with SAC and other seismic software.
Original spec description
Retrieve SAC poles and zeros instrument response information.