<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div><br></div><div>Hello web service users,</div><div><br></div><div>In the next release of our fdsnws-station service the Pole and Zero child elements to the PolesZeros element of a response will be numbered as two groups instead of as a single group. This numbering will match the traditional SEED usage, often exposed in SEED RESP. We expect to release a new version either later this week or next week.</div><div><br></div><div>As an example, in the current version of the service if there are 11 poles and 6 zeros the Pole and Zero elements are numbered from 0 through 16. In the next release the Poles will be numbered from 0 through 10 and the Zeros will be numbered from 0 through 5.</div><div><br></div><div>Examples of the StationXML for before and after the change are below.</div><div><br></div><div>For most users and usage this change will have very little or no effect. If you believe this change will effect your processing please let us know.</div><div><br></div><div>regards,</div><div>IRIS DMC</div><div><br></div><div><br></div><div><br></div><div>Example of current PolesZeros construction:</div><div>-------------</div><div><div style="margin: 0px; font-family: Monaco;"><PolesZeros></div><div style="margin: 0px; font-family: Monaco;"> <InputUnits></div><div style="margin: 0px; font-family: Monaco;"> <Name>M/S</Name></div><div style="margin: 0px; font-family: Monaco;"> <Description>velocity in meters per second</Description></div><div style="margin: 0px; font-family: Monaco;"> </InputUnits></div><div style="margin: 0px; font-family: Monaco;"> <OutputUnits></div><div style="margin: 0px; font-family: Monaco;"> <Name>V</Name></div><div style="margin: 0px; font-family: Monaco;"> <Description>emf in volts</Description></div><div style="margin: 0px; font-family: Monaco;"> </OutputUnits></div><div style="margin: 0px; font-family: Monaco;"> <PzTransferFunctionType>LAPLACE (RADIANS/SECOND)</PzTransferFunctionType></div><div style="margin: 0px; font-family: Monaco;"> <NormalizationFactor>348462000000000000</NormalizationFactor></div><div style="margin: 0px; font-family: Monaco;"> <NormalizationFrequency>.2</NormalizationFrequency></div><div style="margin: 0px; font-family: Monaco;"> <Zero number="0"></div><div style="margin: 0px; font-family: Monaco;"> <Real>0</Real></div><div style="margin: 0px; font-family: Monaco;"> <Imaginary>0</Imaginary></div><div style="margin: 0px; font-family: Monaco;"> </Zero></div><div style="margin: 0px; font-family: Monaco;"> <Zero number="1"></div><div style="margin: 0px; font-family: Monaco;"> <Real>0</Real></div><div style="margin: 0px; font-family: Monaco;"> <Imaginary>0</Imaginary></div><div style="margin: 0px; font-family: Monaco;"> </Zero></div><div style="margin: 0px; font-family: Monaco;"> <Zero number="2"></div><div style="margin: 0px; font-family: Monaco;"> <Real>-463.1</Real></div><div style="margin: 0px; font-family: Monaco;"> <Imaginary>430.5</Imaginary></div><div style="margin: 0px; font-family: Monaco;"> </Zero></div><div style="margin: 0px; font-family: Monaco;"> <Zero number="3"></div><div style="margin: 0px; font-family: Monaco;"> <Real>-463.1</Real></div><div style="margin: 0px; font-family: Monaco;"> <Imaginary>-430.5</Imaginary></div><div style="margin: 0px; font-family: Monaco;"> </Zero></div><div style="margin: 0px; font-family: Monaco;"> <Zero number="4"></div><div style="margin: 0px; font-family: Monaco;"> <Real>-176.6</Real></div><div style="margin: 0px; font-family: Monaco;"> <Imaginary>0</Imaginary></div><div style="margin: 0px; font-family: Monaco;"> </Zero></div><div style="margin: 0px; font-family: Monaco;"> <Zero number="5"></div><div style="margin: 0px; font-family: Monaco;"> <Real>-15.15</Real></div><div style="margin: 0px; font-family: Monaco;"> <Imaginary>0</Imaginary></div><div style="margin: 0px; font-family: Monaco;"> </Zero></div><div style="margin: 0px; font-family: Monaco;"> <Pole number="6"></div><div style="margin: 0px; font-family: Monaco;"> <Real>-13300</Real></div><div style="margin: 0px; font-family: Monaco;"> <Imaginary>0</Imaginary></div><div style="margin: 0px; font-family: Monaco;"> </Pole></div><div style="margin: 0px; font-family: Monaco;"> <Pole number="7"></div><div style="margin: 0px; font-family: Monaco;"> <Real>-10530</Real></div><div style="margin: 0px; font-family: Monaco;"> <Imaginary>10050</Imaginary></div><div style="margin: 0px; font-family: Monaco;"> </Pole></div><div style="margin: 0px; font-family: Monaco;"> <Pole number="8"></div><div style="margin: 0px; font-family: Monaco;"> <Real>-10530</Real></div><div style="margin: 0px; font-family: Monaco;"> <Imaginary>-10050</Imaginary></div><div style="margin: 0px; font-family: Monaco;"> </Pole></div><div style="margin: 0px; font-family: Monaco;"> <Pole number="9"></div><div style="margin: 0px; font-family: Monaco;"> <Real>-520.3</Real></div><div style="margin: 0px; font-family: Monaco;"> <Imaginary>0</Imaginary></div><div style="margin: 0px; font-family: Monaco;"> </Pole></div><div style="margin: 0px; font-family: Monaco;"> <Pole number="10"></div><div style="margin: 0px; font-family: Monaco;"> <Real>-374.8</Real></div><div style="margin: 0px; font-family: Monaco;"> <Imaginary>0</Imaginary></div><div style="margin: 0px; font-family: Monaco;"> </Pole></div><div style="margin: 0px; font-family: Monaco;"> <Pole number="11"></div><div style="margin: 0px; font-family: Monaco;"> <Real>-97.34</Real></div><div style="margin: 0px; font-family: Monaco;"> <Imaginary>400.7</Imaginary></div><div style="margin: 0px; font-family: Monaco;"> </Pole></div><div style="margin: 0px; font-family: Monaco;"> <Pole number="12"></div><div style="margin: 0px; font-family: Monaco;"> <Real>-97.34</Real></div><div style="margin: 0px; font-family: Monaco;"> <Imaginary>-400.7</Imaginary></div><div style="margin: 0px; font-family: Monaco;"> </Pole></div><div style="margin: 0px; font-family: Monaco;"> <Pole number="13"></div><div style="margin: 0px; font-family: Monaco;"> <Real>-15.64</Real></div><div style="margin: 0px; font-family: Monaco;"> <Imaginary>0</Imaginary></div><div style="margin: 0px; font-family: Monaco;"> </Pole></div><div style="margin: 0px; font-family: Monaco;"> <Pole number="14"></div><div style="margin: 0px; font-family: Monaco;"> <Real>-.037</Real></div><div style="margin: 0px; font-family: Monaco;"> <Imaginary>.037</Imaginary></div><div style="margin: 0px; font-family: Monaco;"> </Pole></div><div style="margin: 0px; font-family: Monaco;"> <Pole number="15"></div><div style="margin: 0px; font-family: Monaco;"> <Real>-.037</Real></div><div style="margin: 0px; font-family: Monaco;"> <Imaginary>-.037</Imaginary></div><div style="margin: 0px; font-family: Monaco;"> </Pole></div><div style="margin: 0px; font-family: Monaco;"> <Pole number="16"></div><div style="margin: 0px; font-family: Monaco;"> <Real>-255.1</Real></div><div style="margin: 0px; font-family: Monaco;"> <Imaginary>0</Imaginary></div><div style="margin: 0px; font-family: Monaco;"> </Pole></div><div style="margin: 0px; font-family: Monaco;"></PolesZeros></div></div><div style="margin: 0px; font-family: Monaco;">...</div><div>-------------</div><div><br></div><div><br></div><div><div>Example of new PolesZeros construction with independent Pole and Zero numbering:</div><div>-------------</div></div><div><div style="margin: 0px; font-family: Monaco;"><PolesZeros></div><div style="margin: 0px; font-family: Monaco;"> <InputUnits></div><div style="margin: 0px; font-family: Monaco;"> <Name>M/S</Name></div><div style="margin: 0px; font-family: Monaco;"> <Description>velocity in meters per second</Description></div><div style="margin: 0px; font-family: Monaco;"> </InputUnits></div><div style="margin: 0px; font-family: Monaco;"> <OutputUnits></div><div style="margin: 0px; font-family: Monaco;"> <Name>V</Name></div><div style="margin: 0px; font-family: Monaco;"> <Description>emf in volts</Description></div><div style="margin: 0px; font-family: Monaco;"> </OutputUnits></div><div style="margin: 0px; font-family: Monaco;"> <PzTransferFunctionType>LAPLACE (RADIANS/SECOND)</PzTransferFunctionType></div><div style="margin: 0px; font-family: Monaco;"> <NormalizationFactor>348462000000000000</NormalizationFactor></div><div style="margin: 0px; font-family: Monaco;"> <NormalizationFrequency>.2</NormalizationFrequency></div><div style="margin: 0px; font-family: Monaco;"> <Zero number="0"></div><div style="margin: 0px; font-family: Monaco;"> <Real plusError="0.0" minusError="0.0">0</Real></div><div style="margin: 0px; font-family: Monaco;"> <Imaginary plusError="0.0" minusError="0.0">0</Imaginary></div><div style="margin: 0px; font-family: Monaco;"> </Zero></div><div style="margin: 0px; font-family: Monaco;"> <Zero number="1"></div><div style="margin: 0px; font-family: Monaco;"> <Real plusError="0.0" minusError="0.0">0</Real></div><div style="margin: 0px; font-family: Monaco;"> <Imaginary plusError="0.0" minusError="0.0">0</Imaginary></div><div style="margin: 0px; font-family: Monaco;"> </Zero></div><div style="margin: 0px; font-family: Monaco;"> <Zero number="2"></div><div style="margin: 0px; font-family: Monaco;"> <Real plusError="0.0" minusError="0.0">-463.1</Real></div><div style="margin: 0px; font-family: Monaco;"> <Imaginary plusError="0.0" minusError="0.0">430.5</Imaginary></div><div style="margin: 0px; font-family: Monaco;"> </Zero></div><div style="margin: 0px; font-family: Monaco;"> <Zero number="3"></div><div style="margin: 0px; font-family: Monaco;"> <Real plusError="0.0" minusError="0.0">-463.1</Real></div><div style="margin: 0px; font-family: Monaco;"> <Imaginary plusError="0.0" minusError="0.0">-430.5</Imaginary></div><div style="margin: 0px; font-family: Monaco;"> </Zero></div><div style="margin: 0px; font-family: Monaco;"> <Zero number="4"></div><div style="margin: 0px; font-family: Monaco;"> <Real plusError="0.0" minusError="0.0">-176.6</Real></div><div style="margin: 0px; font-family: Monaco;"> <Imaginary plusError="0.0" minusError="0.0">0</Imaginary></div><div style="margin: 0px; font-family: Monaco;"> </Zero></div><div style="margin: 0px; font-family: Monaco;"> <Zero number="5"></div><div style="margin: 0px; font-family: Monaco;"> <Real plusError="0.0" minusError="0.0">-15.15</Real></div><div style="margin: 0px; font-family: Monaco;"> <Imaginary plusError="0.0" minusError="0.0">0</Imaginary></div><div style="margin: 0px; font-family: Monaco;"> </Zero></div><div style="margin: 0px; font-family: Monaco;"> <Pole number="0"></div><div style="margin: 0px; font-family: Monaco;"> <Real plusError="0" minusError="0">-13300</Real></div><div style="margin: 0px; font-family: Monaco;"> <Imaginary plusError="0" minusError="0">0</Imaginary></div><div style="margin: 0px; font-family: Monaco;"> </Pole></div><div style="margin: 0px; font-family: Monaco;"> <Pole number="1"></div><div style="margin: 0px; font-family: Monaco;"> <Real plusError="0" minusError="0">-10530</Real></div><div style="margin: 0px; font-family: Monaco;"> <Imaginary plusError="0" minusError="0">10050</Imaginary></div><div style="margin: 0px; font-family: Monaco;"> </Pole></div><div style="margin: 0px; font-family: Monaco;"> <Pole number="2"></div><div style="margin: 0px; font-family: Monaco;"> <Real plusError="0" minusError="0">-10530</Real></div><div style="margin: 0px; font-family: Monaco;"> <Imaginary plusError="0" minusError="0">-10050</Imaginary></div><div style="margin: 0px; font-family: Monaco;"> </Pole></div><div style="margin: 0px; font-family: Monaco;"> <Pole number="3"></div><div style="margin: 0px; font-family: Monaco;"> <Real plusError="0" minusError="0">-520.3</Real></div><div style="margin: 0px; font-family: Monaco;"> <Imaginary plusError="0" minusError="0">0</Imaginary></div><div style="margin: 0px; font-family: Monaco;"> </Pole></div><div style="margin: 0px; font-family: Monaco;"> <Pole number="4"></div><div style="margin: 0px; font-family: Monaco;"> <Real plusError="0" minusError="0">-374.8</Real></div><div style="margin: 0px; font-family: Monaco;"> <Imaginary plusError="0" minusError="0">0</Imaginary></div><div style="margin: 0px; font-family: Monaco;"> </Pole></div><div style="margin: 0px; font-family: Monaco;"> <Pole number="5"></div><div style="margin: 0px; font-family: Monaco;"> <Real plusError="0" minusError="0">-97.34</Real></div><div style="margin: 0px; font-family: Monaco;"> <Imaginary plusError="0" minusError="0">400.7</Imaginary></div><div style="margin: 0px; font-family: Monaco;"> </Pole></div><div style="margin: 0px; font-family: Monaco;"> <Pole number="6"></div><div style="margin: 0px; font-family: Monaco;"> <Real plusError="0" minusError="0">-97.34</Real></div><div style="margin: 0px; font-family: Monaco;"> <Imaginary plusError="0" minusError="0">-400.7</Imaginary></div><div style="margin: 0px; font-family: Monaco;"> </Pole></div><div style="margin: 0px; font-family: Monaco;"> <Pole number="7"></div><div style="margin: 0px; font-family: Monaco;"> <Real plusError="0" minusError="0">-15.64</Real></div><div style="margin: 0px; font-family: Monaco;"> <Imaginary plusError="0" minusError="0">0</Imaginary></div><div style="margin: 0px; font-family: Monaco;"> </Pole></div><div style="margin: 0px; font-family: Monaco;"> <Pole number="8"></div><div style="margin: 0px; font-family: Monaco;"> <Real plusError="0" minusError="0">-.037</Real></div><div style="margin: 0px; font-family: Monaco;"> <Imaginary plusError="0" minusError="0">.037</Imaginary></div><div style="margin: 0px; font-family: Monaco;"> </Pole></div><div style="margin: 0px; font-family: Monaco;"> <Pole number="9"></div><div style="margin: 0px; font-family: Monaco;"> <Real plusError="0" minusError="0">-.037</Real></div><div style="margin: 0px; font-family: Monaco;"> <Imaginary plusError="0" minusError="0">-.037</Imaginary></div><div style="margin: 0px; font-family: Monaco;"> </Pole></div><div style="margin: 0px; font-family: Monaco;"> <Pole number="10"></div><div style="margin: 0px; font-family: Monaco;"> <Real plusError="0" minusError="0">-255.1</Real></div><div style="margin: 0px; font-family: Monaco;"> <Imaginary plusError="0" minusError="0">0</Imaginary></div><div style="margin: 0px; font-family: Monaco;"> </Pole></div><div style="margin: 0px; font-family: Monaco;"></PolesZeros></div></div><div style="margin: 0px; font-family: Monaco;">...</div><div>-------------</div><div><br></div><div><br></div><div><br></div></body></html>