# number_of_header_lines: 70
# comment:  
# comment:  ************ USE OF ESRL GMD DATA ****************
# comment:  
# comment: These data are made freely available to the public and the
# comment: scientific community in the belief that their wide dissemination
# comment: will lead to greater understanding and new scientific insights.
# comment: The availability of these data does not constitute publication
# comment: of the data.  NOAA relies on the ethics and integrity of the user to
# comment: ensure that ESRL receives fair credit for their work.  If the data 
# comment: are obtained for potential use in a publication or presentation, 
# comment: ESRL should be informed at the outset of the nature of this work.  
# comment: If the ESRL data are essential to the work, or if an important 
# comment: result or conclusion depends on the ESRL data, co-authorship
# comment: may be appropriate.  This should be discussed at an early stage in
# comment: the work.  Manuscripts using the ESRL data should be sent to ESRL
# comment: for review before they are submitted for publication so we can
# comment: insure that the quality and limitations of the data are accurately
# comment: represented.
# comment:  
# comment: Every effort is made to produce the most accurate and precise
# comment: measurements possible.  However, we reserve the right to make
# comment: corrections to the data based on recalibration of standard gases
# comment: or for other reasons deemed scientifically justified.
# comment: 
# comment: We are not responsible for results and conclusions based on use
# comment: of these data without regard to this warning.
# comment: 
# contact_parameter: CH4C13 SIL (Individual Flasks)
# contact_name: Bruce H Vaughn
# contact_telephone: (303) 492-7985
# contact_email: Bruce.Vaughn@colorado.edu
# comment: 
# comment:  ************ COLLABORATORS ***************
# comment: 
# comment: NOAA thanks the following collaborators without
# comment: whom these measurements would not be possible.
# comment: 
# collaborator_name: National Science Foundation Office of Polar
# collaborator_name: Programs [NSF]
# collaborator_url: http://www.nsf.gov/dir/index.jsp?org=OPP
# comment: 
# comment:  ************ RECIPROCITY AGREEMENT ***************
# comment: 
# comment: Use of these data implies an agreement to reciprocate.
# comment: Laboratories making similar measurements agree to make their
# comment: own data available to the general public and to the scientific
# comment: community in an equally complete and easily accessible form.
# comment: Modelers are encouraged to make available to the community,
# comment: upon request, their own tools used in the interpretation
# comment: of the ESRL data, namely well documented model code, transport
# comment: fields, and additional information necessary for other
# comment: scientists to repeat the work and to run modified versions.
# comment: Model availability includes collaborative support for new
# comment: users of the models.
# comment:
# comment:  ************ DATA DESCRIPTION ***************
# comment:
# description_site-code: sum
# description_project-abbr: ccg_surface
# description_strategy-abbr: flask
# description_analysis-constraints: flag:..%
# description_creation-time: 2018-09-24 14:38:43
# comment:
# comment:  ************ DATA DOCUMENTATION ***************
# comment:
# comment: Please refer to the species-specific README file in the
# comment: appropriate directory folder at ftp://aftp.cmdl.noaa.gov/data/trace_gases/.
# comment:
# data_fields: site year month value
SUM 2010  4  -47.262
SUM 2010  5  -47.236
SUM 2010  6  -47.248
SUM 2010  7  -47.338
SUM 2010  8  -47.457
SUM 2010  9  -47.532
SUM 2010 10  -47.534
SUM 2010 11  -47.482
SUM 2010 12  -47.420
SUM 2011  1  -47.391
SUM 2011  2  -47.398
SUM 2011  3  -47.423
SUM 2011  4  -47.421
SUM 2011  5  -47.375
SUM 2011  6  -47.340
SUM 2011  7  -47.391
SUM 2011  8  -47.546
SUM 2011  9  -47.702
SUM 2011 10  -47.740
SUM 2011 11  -47.659
SUM 2011 12  -47.543
SUM 2012  1  -47.481
SUM 2012  2  -47.463
SUM 2012  3  -47.432
SUM 2012  4  -47.364
SUM 2012  5  -47.275
SUM 2012  6  -47.241
SUM 2012  7  -47.319
SUM 2012  8  -47.487
SUM 2012  9  -47.650
SUM 2012 10  -47.751
SUM 2012 11  -47.729
SUM 2012 12  -47.637
SUM 2013  1  -47.537
SUM 2013  2  -47.483
SUM 2013  3  -47.454
SUM 2013  4  -47.391
SUM 2013  5  -47.301
SUM 2013  6  -47.259
SUM 2013  7  -47.324
SUM 2013  8  -47.480
SUM 2013  9  -47.611
SUM 2013 10  -47.657
SUM 2013 11  -47.603
SUM 2013 12  -47.530
SUM 2014  1  -47.505
SUM 2014  2  -47.520
SUM 2014  3  -47.520
SUM 2014  4  -47.462
SUM 2014  5  -47.372
SUM 2014  6  -47.327
SUM 2014  7  -47.374
SUM 2014  8  -47.491
SUM 2014  9  -47.590
SUM 2014 10  -47.605
SUM 2014 11  -47.549
SUM 2014 12  -47.468
SUM 2015  1  -47.421
SUM 2015  2  -47.418
SUM 2015  3  -47.427
SUM 2015  4  -47.415
SUM 2015  5  -47.390
SUM 2015  6  -47.398
SUM 2015  7  -47.481
SUM 2015  8  -47.600
SUM 2015  9  -47.703
SUM 2015 10  -47.728
SUM 2015 11  -47.695
SUM 2015 12  -47.646
SUM 2016  1  -47.608
SUM 2016  2  -47.571
SUM 2016  3  -47.509
SUM 2016  4  -47.440
SUM 2016  5  -47.404
SUM 2016  6  -47.440
SUM 2016  7  -47.537
SUM 2016  8  -47.675
SUM 2016  9  -47.774
SUM 2016 10  -47.791
SUM 2016 11  -47.741
SUM 2016 12  -47.670
SUM 2017  1  -47.621
SUM 2017  2  -47.593
SUM 2017  3  -47.561
SUM 2017  4  -47.506
SUM 2017  5  -47.443
SUM 2017  6  -47.437
SUM 2017  7  -47.510
SUM 2017  8  -47.641
SUM 2017  9  -47.741
SUM 2017 10  -47.751
SUM 2017 11  -47.694
SUM 2017 12  -47.636