PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/23-18:57:50
G01     77.3           33.3               12.8 +/-    1.11      21.0 +/-    1.11  0.080 / 0.170
G07     134.1          36.4               14.8 +/-    1.04      23.0 +/-    1.04  0.090 / 0.190
G11     58.4           34.9               10.9 +/-    0.57      17.4 +/-    0.57  0.030 / 0.040
G13     281.5          37.8               13.8 +/-    0.84      20.9 +/-    0.84  0.030 / 0.040
G15     307.7          13.6               10.6 +/-    1.93      27.2 +/-    1.93  0.040 / 0.090
G17     225.0          61.1               18.0 +/-    1.05      20.2 +/-    1.05  0.040 / 0.090
G18     53.8           20.8                9.6 +/-    1.71      20.8 +/-    1.71  0.050 / 0.130
G19     220.5          35.4               15.5 +/-    1.41      24.4 +/-    1.41  0.050 / 0.120
G28     10.1           60.4               11.0 +/-    0.69      12.5 +/-    0.69  0.040 / 0.060
G30     128.8          66.3               14.5 +/-    0.58      15.7 +/-    0.58  0.040 / 0.050