Correct carbon ref output

Usage

correct_carbon_ref_output(
  std_list,
  site,
  omit_already_corrected = TRUE,
  co2_tol = 5,
  d13c_tol = 0.25,
  ref_gas
)

std_list: List containing reference/validation gas measurements.
site: Four-letter NEON site code.
omit_already_corrected: Skip correction if the reference gas values have already been corrected in the files (default TRUE) If you have older versions of the files, you may want to set this to FALSE.
co2_tol: Tolerance used to identify a mismatch in CO2 values. Will correct measured CO2 values within +/- co2_tol within time period identified as having incorrect reference values.
d13c_tol: Tolerance used to identify a mismatch in d13C values. Will correct measured d13C values within +/- d13c_tol within time period identified as having incorrect reference values.
ref_gas: Which reference gas is being corrected? Expects "co2High", "co2Med", or "co2Low"

A version of std_list with corrected reference values.