PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/07/18-15:57:50
G02     200.4          16.1                9.8 +/-    1.68      23.9 +/-    1.68  0.110 / 0.160
G06     171.1          50.3               10.0 +/-    0.59      12.6 +/-    0.59  0.140 / 0.160
G13     228.4          15.6               10.8 +/-    1.26      26.4 +/-    1.26  0.040 / 0.050
G17     12.7           64.6                8.7 +/-    1.26       9.5 +/-    1.26  0.050 / 0.050
G19     315.5          72.0                8.9 +/-    0.43       9.3 +/-    0.43  0.060 / 0.080
G24     312.0          26.7                9.0 +/-    1.67      16.9 +/-    1.67  0.050 / 0.070
G28     79.2           46.3                8.1 +/-    1.57      10.7 +/-    1.57  0.040 / 0.030
G30     156.3          16.6                7.0 +/-    1.12      16.8 +/-    1.12  0.030 / 0.040