# obspy.core.inventory.response.InstrumentPolynomial.__init__

`InstrumentPolynomial.``__init__`(input_units, output_units, frequency_lower_bound, frequency_upper_bound, approximation_lower_bound, approximation_upper_bound, maximum_error, coefficients, approximation_type='MACLAURIN', resource_id=None, name=None, input_units_description=None, output_units_description=None, description=None)

  Parameters: | approximation_type (str) Approximation type. Currently restricted to ‘MACLAURIN’ by StationXML definition. frequency_lower_bound (float) Lower frequency bound. frequency_upper_bound (float) Upper frequency bound. approximation_lower_bound (float) Lower bound of approximation. approximation_upper_bound (float) Upper bound of approximation. maximum_error (float) Maximum error. coefficients (list of floats) List of polynomial coefficients. input_units string input_units The units of the data as input from the perspective of data acquisition. After correcting data for this response, these would be the resulting units. Name of units, e.g. “M/S”, “V”, “PA”. output_units string output_units The units of the data as output from the perspective of data acquisition. These would be the units of the data prior to correcting for this response. Name of units, e.g. “M/S”, “V”, “PA”. resource_id (str) This field contains a string that should serve as a unique resource identifier. This identifier can be interpreted differently depending on the data center/software that generated the document. Also, we recommend to use something like GENERATOR:Meaningful ID. As a common behavior equipment with the same ID should contains the same information/be derived from the same base instruments. name (str) A name given to the filter stage. input_units_description string, optional input_units_description The units of the data as input from the perspective of data acquisition. After correcting data for this response, these would be the resulting units. Description of units, e.g. “Velocity in meters per second”, “Volts”, “Pascals”. output_units_description (str, optional) The units of the data as output from the perspective of data acquisition. These would be the units of the data prior to correcting for this response. Description of units, e.g. “Velocity in meters per second”, “Volts”, “Pascals”. description (str, optional) A short description of of the filter.

### Thank you!

We would like to thank our contributors, whose efforts make this software what it is. These people have helped by writing code and documentation, and by testing. They have created and maintained this product, its associated libraries and applications, our build tools and our web sites.

#### Contributors

- Ackerley, Nick
- Allgeyer, Sebastien
- Ammon, Charles J.
- Antunes, Emanuel
- Arnarsson, Ólafur St.
- Bank, Markus
- Barsch, Robert
- Behr, Yannik
- Bernardi, Fabrizio
- Bernauer, Felix
- Bes de Berc, Maxime
- Beyreuther, Moritz
- Boltz, Shawn
- Bonaimé, Sébastien
- Carothers, Lloyd
- Chamberlain, Calum
- Chambers, Derrick
- Chen, Zhao
- Clark, Adam
- Danecek, Peter
- Egdorf, Sven
- Engels, Fabian
- Ermert, Laura
- Eulenfeld, Tom

- Fabbri, Tommaso
- Falco, Nicholas
- Fee, Jeremy
- Grellier, Clément
- Grunberg, Marc
- Hammer, Conny
- Heimann, Sebastian
- Heiniger, Lukas
- Hope, Gaute
- Igel, Heiner
- Inza, Adolfo
- Isken, Marius
- Ketchum, David
- Koymans, Mathijs
- Kremers, Simon
- Kress, Victor
- Krieger, Lars
- Krischer, Lion
- Kula, Damian
- Käufl, Paul
- Köhler, Andreas
- Lecocq, Thomas
- Leeman, John
- Legovini, Paride

- Lesage, Philippe
- Li, Yulin
- Lomax, Anthony
- Lopes, Rui L.
- MacCarthy, Jonathan
- Maggi, Alessia
- Martin, Henri
- Medlin, Andrew
- Megies, Tobias
- Meschede, Matthias
- Michelini, Alberto
- Miller, Nathaniel C.
- Morgenstern, Bernhard
- Nof, Ran Novitsky
- Panning, Mark P.
- Parker, Tom
- Pestourie, Romain
- Rapagnani, Giovanni
- Reyes, Celso
- Ringler, Adam
- Rothenhäusler, Nicolas
- Russo, Emiliano
- Sales de Andrade, Elliott

- Satriano, Claudio
- Saul, Joachim
- Scheingraber, Chris
- Schneider, Simon
- Sippl, Christian
- Snoke, Arthur
- Stange, Stefan
- Stähler, Simon C.
- Sullivan, Benjamin
- Tian, Dongdong
- Trabant, Chad
- Trani, Luca
- Uieda, Leonardo
- Walker, Andrew
- Walther, Marcus
- Wassermann, Joachim
- Williams, Mark C.
- Winkelman, Andrew
- Zaccarelli, Riccardo
- Zad, Seyed Kasra Hosseini
- Zhu, Lijun
- van Driel, Martin
- van Wijk, Kasper

#### Funds

ObsPy was partially funded by the

- German Science Foundation (DFG) via grant DFG IG 16/9-1
- German Ministry for Education and Research (BMBF), GEOTECHNOLOGIEN grant 03G0646H.
- NERA project (Network of European Research Infrastructures for Earthquake Risk Assessment and Mitigation) under the European Community's Seventh Framework Programme (FP7/2007-2013) grant agreement n° 262330
- Leibniz Institute for Applied Geophysics (LIAG)
- VERCE EU-FP7 project (no. 283543)