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Table 1 Constraint parameters used in the GPS tomography

From: Medium-scale traveling ionospheric disturbances by three-dimensional ionospheric GPS tomography

Altitude Constraint value
80 km 10−1
180 km 10−3
650 km 10−3
1000 km 10−2
1500 km 10−1
2000 km 1
25,000 km 1