PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/28-22:27:50
G02     199.5          18.4               19.0 +/-    1.85      43.5 +/-    1.85  0.040 / 0.070
G06     171.7          50.5               15.4 +/-    1.12      19.2 +/-    1.12  0.040 / 0.080
G13     230.0          15.3               17.2 +/-    2.90      42.4 +/-    2.90  0.080 / 0.160
G17     10.1           65.4               11.3 +/-    1.01      12.3 +/-    1.01  0.070 / 0.190
G19     307.7          71.0               11.4 +/-    1.10      12.0 +/-    1.10  0.100 / 0.300
G24     312.1          27.1                9.0 +/-    2.62      16.8 +/-    2.62  0.090 / 0.300
G28     84.4           41.3               13.0 +/-    0.70      18.5 +/-    0.70  0.050 / 0.070
G30     156.3          16.6               17.2 +/-    2.41      41.1 +/-    2.41  0.030 / 0.050