anchor.diff:  layer,vwc,Volumetric % Moisture - percent,vwc,,,sample,numeric,value,percent,,,
   layer,soc,Bulk Layer Calculated Soil Organic Carbon Stock - g cm-2,soc,soil organic carbon,,sample,numeric,value,g cm-2,,,
   layer,soc_type,Bulk Layer Calculated Soil Organic Carbon Stock Type - (ccon_type),soc,,,sample,character,method,,,,
  -layer,soc_sigma,Bulk Layer Calculated Soil Organic Carbon Stock Standard Deviation - g cm-2,soc,,,sample,numeric,sigma,g cm-2,,,
  +layer,soc_sigma,Bulk Layer Calculated Soil Organic Carbon Stock Standard Deviation - g cm-2,soc,,,sample,numeric,sigma,,,,
   layer,soc_method,Bulk Layer Calculated Soil Organic Carbon Stock Method - ,soc,,,sample,character,method,,,,
   layer,c_tot,Bulk Layer Total Carbon - percent,c_tot,carbon concentration in a dry combustion analysis,,sample,numeric,value,percent,,,
   layer,oc,Bulk Layer Organic Carbon - percent,oc,organic carbon either acidification+dry combustion or Walkly-Black,,sample,numeric,value,percent,,,
  
positive.code: layer,root_weight,<2mm Root Mass - g,root_weight,mass of roots in sample,,sample,numeric,value,g,,,
  layer,15n,Bulk Layer δ15N - permil,15n,15N isotope ratio,,sample,numeric,value,permil,,,
  layer,13c,Bulk Layer δ13C - permil,13c,13C isotope ratio,,sample,numeric,value,permil,,,
  layer,rc_lab,Radiocarbon Laboratory ID - (rc_lab),(15n)|(13c)|(14c),,,sample,character,method,,,,
  layer,rc_lab_number,Radiocarbon Laboratory Sample Number - ,(15n)|(13c)|(14c),,,sample,character,method,,,,
  layer,rc_year,Radiocarbon Analysis Year - YYYY,(15n)|(13c)|(14c),,,sample,character,method,YYYY,,,
  layer,14c,Bulk Layer Δ14C - permil,14c,14C isotope ratio,,sample,numeric,value,permil,,,
  layer,14c_sigma,Bulk Layer Δ14C Standard Deviation - permil,14c,,,sample,numeric,sigma,permil,,,
  layer,14c_age,Bulk Layer Uncalibrated Radiocarbon Age - BP,14c_age,Age from 14C,,sample,numeric,value,BP,,,
  layer,14c_age_sigma,Bulk Layer Uncalibrated Radiocarbon Age Standard Deviation - BP,14c_age,,,sample,numeric,sigma,BP,,,
  layer,fraction_modern,Bulk Layer Fraction Modern - ,fraction_modern,fraction of modern from other isotope,,sample,numeric,value,,,,
  layer,fraction_modern_sigma,Bulk Layer Fraction Modern Standard Deviation - ,fraction_modern,,,sample,numeric,sigma,,,,
  layer,textureClass,Texture Class - ,textureClass,texture class,,field,character,,,,,
  
negative.code: gas,c_conc_CH4,CH4 Concentration - ppm,,,,sample,numeric,value,ppm,,,
  gas,13c_CH4,Gas δ13C (CH4) - permil,,,,sample,numeric,value,permil,,,
  gas,14c_CH4,Gas Δ14C (CH4) - permil,,,,sample,numeric,value,permil,,,
  gas,14c_CH4_sigma,Gas Δ14C Standard Deviation (CH4) - permil,,,,sample,numeric,sigma,,,,
  gas,14c_age_CH4,Gas Uncalibrated Radiocarbon Age (CH4) - ,,,,sample,numeric,value,,,,
  gas,14c_age_CH4_sigma,Gas Uncalibrated Radiocarbon Age Standard Deviation (CH4) - ,,,,sample,numeric,sigma,,,,
  gas,fraction_modern_CH4,Gas Fraction Modern (CH4) - ,,,,sample,numeric,value,,,,
  gas,fraction_modern_CH4_sigma,Gas Fraction Modern Standard Deviation (CH4) - ,,,,sample,numeric,sigma,,,,
  other,other_name,Other Sample Name - ,,,,field,character,,,,,
  other,other_number,Laboratory Other Sample Number - ,,,,field,character,,,,,
  other,other_type,Other Sample Type - (other_type),,,,field,character,,,,,
  other,other_note,Other Sample Type Notes - ,,,,field,character,,,,,
  other,collection_method,Other Sample Collection Method - (core_pit),,,,field,factor,,,,,
  other,processing_method,Other Sample Processing Method - ,,,,field,character,,,,,
  other,plant_species,Plant Species - ,,,,field,character,,,,,
  other,root_live_flag,Roots Live/Dead - ,,,,field,character,,,,,
  