PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/20-02:57:50
G01     38.5           11.7                3.2 +/-    3.75       8.6 +/-    3.75  0.030 / 0.040
G02     198.8          15.7                5.7 +/-    1.90      13.9 +/-    1.90  0.030 / 0.040
G06     175.4          44.4                9.2 +/-    1.64      12.6 +/-    1.64  0.040 / 0.050
G13     233.3          17.9                5.3 +/-    2.30      12.3 +/-    2.30  0.070 / 0.060
G15     264.6          10.1                3.5 +/-    2.33       9.8 +/-    2.33  0.040 / 0.070
G17     9.2            66.6                3.5 +/-    0.61       3.8 +/-    0.61  0.040 / 0.070
G19     299.3          71.3                3.5 +/-    0.78       3.7 +/-    0.78  0.170 / 0.240
G24     314.4          23.6                2.0 +/-    3.74       4.1 +/-    3.74  0.160 / 0.290
G28     80.3           43.1                4.3 +/-    0.92       5.9 +/-    0.92  0.120 / 0.590
G30     154.8          17.7                6.3 +/-    2.70      14.6 +/-    2.70  0.100 / 0.410