What does the M, D, R, or Q character mean in my data file name?
This is a quality control marker.
M = Merged data, a new post-processing scheme being implemented at IRIS DMC to present clean data traces from multiple pieces of data.
Q = Data tagged as Quality Controlled by the network operator
D = Data of indeterminate quality – this is a legacy tag for older data
R = Raw Data as a result of real-time telemetry to the DMC
For more details about the markers and how you can customize your data requests, please view this DMC newsletter article:
[ http://www.iris.edu/news/newsletter/vol4no2/page1.htm ]
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