| Acronym | Meaning |
 | HEBBLE | High Energy Benthic Boundary Layer Experiment |
| PPE | Porcine Pancreatic Elastase |
| NADB | National Air Data Branch (US EPA) |
| PBTK | Physiologically Based Toxicokinetics |
| JPL | Jet Propulsion Laboratory |
| VIRTIS | Visual IR Spectral And Thermal Spectrometer |
| TDCS | Total Dissolved And Colloidal Solids |
| PDF | Probability-distribution Function |
| ORAQI | Oak Ridge Air Quality Index |
| HFP | Hartree-Fock Perturbation |
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