On 23 April 2018, we provided updated processed data files with the the 
addition of a column containing the number of data points for each hourly 
average.  We also added data from 2017 to the dataset. Furthermore, we 
updated the readme, use constraints and headers for consistency.


Update on 23 July 2018
Throughout the previous version of the hourly data file 
PSU_INFLUX_INSITU_SITE02_2011_136M_num.dat, about 10 lines with duplicate 
times were discovered and removed for the updated file.

Update on 20 October 2019
We corrected quality flags (i.e., changed from "1" to "9") for isolated erroneous points in three files:  
PSU_INFLUX_INSITU_SITE03_2012_54M_num.dat.gz
PSU_INFLUX_INSITU_SITE02_2012_136M_num.dat.gz
PSU_INFLUX_INSITU_SITE10_2013_40M_num.dat.gz