Compatibility of 3.3 μm band (broad gray vertical stripe) and aliphatic 3.4 − 3.5 μm subfeatures (narrow gray vertical stripes) of laboratory results and observations. In the top panel, the spectra of samples #1 and #2 are given in addition to those of the ISO-SWS (AOT1) observations toward the galactic center (Sgr A*, GCS 3 and GCS 4; Chiar et al. 2000). In the bottom panel, the spectra of samples #3 (703 K) and #4 are given in addition to those of observations toward the bright interstellar regions (NGC 2023 and the Orion Bar; Verstraete et al. 2001) and of observations toward two positions (ionized and neutral regions) in the Orion Bar emission region (Sloan et al. 1997) from United Kingdom Infrared Telescope (UKIRT).