rTrend
Removes the trend of the seismograms.
Example
<rTrend/>
Places this can be found
In seismogramProcess there is a choice between all of the following
- printlineSeismogramProcess
 - sacWriter
 - mseedWriter
 - asciiWriter
 - wavWriter
 - recordSectionDisplayGenerator
 - responseGain
 - phaseCut
 - requestCut
 - merge
 - gapFill
 - rMean
 - rTrend
 - taper
 - externalWaveformProcess
 - seismogramScript
 - localSeismogramTemplateGenerator
 - filter
 - rms
 - oregonDSPFilter
 - forkProcess
 - alwaysSuccess
 - phaseSignalToNoise
 - compoundPhaseSignalToNoise
 - seismogramImageProcess
 - legacyExecute
 - seismogramAND
 - seismogramOR
 - seismogramNOT
 - someDataCoverage
 - noDataGaps
 - fullDataCoverage
 - integrate
 - differentiate
 - transferResponse
 - collapseOverlaps
 - div
 - mul
 - invertFlippedChannels
 - seismogramSampling
 - decimate
 - stddev
 - rms
 - mean
 - minMax
 - compressionType
 - availableDataPlus