图3. 理论最佳延拓高度的延拓场 a—5 m的向上延拓场;b—8 m的向上延拓场;c—5 m的向上延拓剩余场;d—8 m的向上延拓剩余场
Fig.3. The continued anomaly at the best continuation height a—continued anomaly at 5 m;b—continued anomaly at 8 m;c—residual anomaly at 5 m;d—residual anomaly at 8 m