| Acronym | Meaning |
 | HREE | Heavy Rare Earth Element(s) |
| SOF | Soluble Organic Fraction |
| CTOF | Charge Time-of-Flight Spectrometer |
| SPPD | Spin Polarized Photoelectron Diffraction |
| EDA | Electron Donor-acceptor |
| CEPA-VAR | Coupled-electron-pair Approxn.-variational |
| HPPLC | High-performance Precipitation Liquid Chromatography |
| GCR | Galactic Cosmic Rays (spacecraft Orbit) |
| MCE | Multichannel Eikonal (method For Scattering Calcns.) |
| PDS | Piecewise Direct Standardization |
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