PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/12/20-04:57:40
G01     40.1           15.2                2.8 +/-    2.20       7.0 +/-    2.20  0.070 / 0.100
G06     174.3          37.5                6.8 +/-    1.14      10.3 +/-    1.14  0.070 / 0.090
G13     237.0          23.5                5.7 +/-    1.48      11.5 +/-    1.48  0.170 / 0.200
G15     268.5          12.9                2.4 +/-    2.08       6.2 +/-    2.08  0.220 / 0.270
G17     2.4            71.0                5.4 +/-    0.56       5.7 +/-    0.56  0.060 / 0.080
G19     277.1          70.6                5.5 +/-    0.66       5.8 +/-    0.66  0.060 / 0.070
G24     317.1          17.0                2.6 +/-    5.28       6.1 +/-    5.28  0.040 / 0.060
G28     59.5           53.9                6.1 +/-    1.48       7.4 +/-    1.48  0.040 / 0.050
G30     155.7          32.8                8.8 +/-    1.26      14.6 +/-    1.26  0.030 / 0.020