| 利用IGRF模型计算全张量地磁梯度 | 
| 钟炀, 管彦武, 石甲强, 肖锋 | 
| The calculation method of full tensor geomagnetic gradient based on IGRF model | 
| Yang ZHONG, Yan-Wu GUAN, Jia-Qiang SHI, Feng XIAO | 
| 图3 地磁场偏角D(a)及倾角I(b)等值线 | 
| Fig.3 Contour map of geomagnetic field deviation(a) and dip angle(b) | 
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