PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/13-18:27:50
G01     113.5          21.9               14.4 +/-    1.27      30.4 +/-    1.27  0.050 / 0.070
G07     94.5           63.4               12.9 +/-    0.60      14.2 +/-    0.60  0.060 / 0.090
G08     43.5           28.4                8.7 +/-    0.61      15.7 +/-    0.61  0.050 / 0.050
G09     176.2          19.9               14.8 +/-    1.40      32.7 +/-    1.40  0.030 / 0.040
G11     99.7           42.1               13.5 +/-    0.60      19.1 +/-    0.60  0.060 / 0.060
G13     314.4          24.0               11.4 +/-    2.34      22.8 +/-    2.34  0.070 / 0.070
G17     204.4          27.9               15.0 +/-    2.31      27.4 +/-    2.31  0.050 / 0.080
G18     88.0           23.0               10.4 +/-    0.82      21.3 +/-    0.82  0.050 / 0.070
G28     305.2          59.6               12.6 +/-    0.95      14.4 +/-    0.95  0.030 / 0.040
G30     3.7            74.2               13.5 +/-    0.51      14.0 +/-    0.51  0.030 / 0.040