PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/12/20-13:57:50
G10     277.0          45.0                4.9 +/-    1.14       6.6 +/-    1.14  0.110 / 0.110
G13     38.4           10.7                1.1 +/-    8.84       3.1 +/-    8.84  0.120 / 0.130
G15     50.5           38.5                3.3 +/-    1.02       4.9 +/-    1.02  0.030 / 0.040
G20     322.4          64.8                4.7 +/-    0.67       5.2 +/-    0.67  0.040 / 0.030
G21     33.5           75.7                4.9 +/-    0.63       5.1 +/-    0.63  0.080 / 0.130
G24     115.4          18.7                7.9 +/-    1.20      17.8 +/-    1.20  0.080 / 0.110
G27     314.5          25.0                2.7 +/-    1.81       5.3 +/-    1.81  0.060 / 0.060
G29     168.1          24.1                6.0 +/-    1.67      12.0 +/-    1.67  0.080 / 0.040
G32     204.7          17.9                4.0 +/-    3.02       9.3 +/-    3.02  0.110 / 0.320