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| rigid boundaries (OKokhonova) | |||
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| fixed boundary (freedomanna) | |||
| tight bound | |||
| high-impedance contrast; high-velocity contrast | |||
| sharp discontinuity (очень контрастная по скорости пород) | |||
| large velocity contrast (очень контрастная по скорости пород) | |||
| жесткие границы: 13 phrases in 4 subjects |
| Electronics | 1 |
| Geophysics | 5 |
| Makarov | 4 |
| Technology | 3 |