These are the flux priors for CT2017, comprising two biosphere model
  NEE (excluding wildfire), two wildfire emissions, two air-sea gas
  exchange estimates, and two fossil fuel emissions scenarios.

  Do not use these priors without obtaining consent from the upstreams
  data providers.  Please contact us at carbontracker.team@noaa.gov to
  discuss what sorts of rstrictions may be placed on these data.

  The prior fluxes are:

  b4 - GFED 4.1s land NEE (excluding wildfire)
  bc - GFED_CMS land NEE (excluding wildfire)
  w4 - GFED 4.1s wildfire
  wc - GFED_CMS wildfire
  oi - OIF ocean inversion fluxes
  oc - Climatological (Takahashi et al. 2009) pCO2 ocean flux with trend
  fm - Miller fossil fuel
  fo - ODIAC fossil fuel

  See the CT2017 documentation for details about these priors.

  Files ending in prior_3hrly.nc are 3-hourly and files ending in
  prior.nc are weekly.

  See the CT2017 documentation for details about temporal downscaling
  of the NEE, fossil, and wildfire emissions.