PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/13-17:57:20
G02     204.1          34.5               13.9 +/-    1.47      22.3 +/-    1.47  0.060 / 0.080
G06     152.4          71.4               11.5 +/-    0.56      12.1 +/-    0.56  0.070 / 0.100
G12     309.2          19.0               10.4 +/-    1.36      23.5 +/-    1.36  0.030 / 0.030
G17     36.9           48.5                9.0 +/-    1.65      11.6 +/-    1.65  0.040 / 0.020
G19     357.0          65.7                9.9 +/-    0.63      10.7 +/-    0.63  0.070 / 0.170
G24     295.5          39.5                9.8 +/-    5.26      14.3 +/-    5.26  0.080 / 0.140
G28     103.6          30.4               11.0 +/-    0.91      19.1 +/-    0.91  0.040 / 0.040