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We use the Cosmic Assembly Near-Infrared Deep Extragalactic Legacy Survey(CANDELS) GOODS-S multi-wavelength catalog to identify counterparts for 20 LyaEmitting (LAE) galaxies at z=2.1. We build several types of stacked SpectralEnergy Distributions (SEDs) of these objects. We combine photometry to formaverage and median flux-stacked SEDs, and postage stamp images to form averageand median image-stacked SEDs. We also introduce scaled flux stacks thateliminate the influence of variation in overall brightness. We use the SEDfitting code SpeedyMC to constrain the physical properties of individualobjects and stacks. Our LAEs at z = 2.1 have stellar masses ranging from 2x10^7Msun - 8x10^9 Msun (median = 3x10^8 Msun), ages ranging from 4 Myr to 500 Myr(median =100 Myr), and E(B-V) between 0.02 and 0.24 (median = 0.12). We do notobserve strong correlations between Lya equivalent width (EW) and stellar mass,age, or E(B-V). The Lya radiative transfer (q) factors of our sample arepredominantly close to one and do not correlate strongly with EW or E(B-V),implying that Lya radiative transfer prevents Lya photons from resonantlyscattering in dusty regions. The SED parameters of the flux stacks match theaverage and median values of the individual objects, with the flux-scaledmedian SED performing best with reduced uncertainties. Median image-stackedSEDs provide a poor representation of the median individual object, and none ofthe stacking methods captures the large dispersion of LAE properties.

To Stack or Not to Stack: Spectral Energy Distribution Properties of Lya-Emitting Galaxies at z=2.1