APOGEE Data Releases 13 and 14: Data and Analysis
  Data and analysis methodology used for the SDSS/APOGEE Data Releases 13 and
14 are described, highlighting differences from the DR12 analysis presented in
Holtzman (2015). Some improvement in the handling of telluric absorption and
persistence is demonstrated. The derivation and calibration of stellar
parameters, chemical abundances, and respective uncertainties are described,
along with the ranges over which calibration was performed. Some known issues
with the public data related to the calibration of the effective temperatures
(DR13), surface gravity (DR13 and DR14), and C and N abundances for dwarfs
(DR13 and DR14) are highlighted. We discuss how results from a data-driven
technique, The Cannon (Casey 2016), are included in DR14, and compare those
with results from the APOGEE Stellar Parameters and Chemical Abundances
Pipeline (ASPCAP). We describe how using The Cannon in a mode that restricts
the abundance analysis of each element to regions of the spectrum with known
features from that element leads to Cannon abundances can lead to significantly
different results for some elements than when all regions of the spectrum are
used to derive abundances.
