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Station details:
================

Code: PGRA
Latitude:  39.02933
Longitude:  -27.98133
Elevation:   245.0
Depth: 
Name: Graciosa
Region: Azores,Portugal
Status: 

        
Arrival picks statistics
Travel Time Analysis
On the top graph every dot represents the median residual for one month of data. The green line is the overall median; the orange line shows the standard deviation (smad) based on the median absolute deviation (mad), whilst the red line shows twice the standard deviation (2 * smad).
The bottom graph shows the number of residuals for each month. The red columns show the number of residuals whose median (for that month) is outside two standard deviations from the overall median (2 * smad).
Red dots indicate a possible clock error.
 

Station comments:
=================

opened 1997?

Data at the ISC for 28 years between 1998 and 2025.