PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/21-17:58:00
G01     112.4          22.6               11.9 +/-    1.02      24.6 +/-    1.02  0.040 / 0.040
G07     97.0           62.5               11.2 +/-    0.52      12.5 +/-    0.52  0.030 / 0.040
G08     43.1           26.9               10.0 +/-    1.15      18.7 +/-    1.15  0.070 / 0.120
G09     175.9          18.6               10.4 +/-    1.51      23.7 +/-    1.51  0.070 / 0.100
G11     97.7           42.3               11.7 +/-    0.83      16.4 +/-    0.83  0.040 / 0.030
G13     313.6          24.9               12.2 +/-    2.00      23.9 +/-    2.00  0.030 / 0.030
G17     204.7          29.6               13.1 +/-    1.69      23.1 +/-    1.69  0.040 / 0.080
G18     86.6           23.3                9.1 +/-    1.26      18.5 +/-    1.26  0.040 / 0.070
G28     307.5          59.9               10.6 +/-    0.76      12.1 +/-    0.76  0.050 / 0.060
G30     6.4            75.0               12.4 +/-    0.36      12.8 +/-    0.36  0.040 / 0.060