What does the M, D, R, or Q character mean in my data file name?
This is a quality control marker.
||Merged data, a new post-processing scheme being implemented at IRIS DMC to present clean data traces from multiple pieces of data.|
||Data tagged as Quality Controlled by the network operator|
||Data of indeterminate quality – this is a legacy tag for older data|
||Raw Data as a result of real-time telemetry to the DMC|
UPDATE: All data accessed form the IRIS DMC is now delivered as ‘M’ quality data.