# optional fields
benchmark => 'Public_AR_ACS2013', # default is "Public_AR_Current"
vintage => 'Census2010_ACS2013', # default is "Current_Current"
# optional fields
benchmark => 'Public_AR_ACS2013', # default is "Public_AR_Current"
vintage => 'Census2010_ACS2013', # default is "Current_Current"