Abundance of complex organic molecules relative to CH₃OH for different types of sources, after Öberg et al. (2011): from left to right, low-mass outflows, low-mass YSOs observed with single-dish (tracing envelopes), low-mass YSOs observed with interferometers (tracing the inner envelope/disk at ~500 AU spatial scale), intermediate-mass YSOs observed with interferometers (also at 500 AU spatial scale, this work and Palau et al. 2011), and Orion (references in Table 6). Symbols with cold colors correspond to HCO-rich molecules (black: CH₃OCHO; blue: CH₃CHO), and symbols with warm colors correspond to CH_3/2-rich molecules (orange: CH₃OCH₃; red: CH₃CH₂OH).