PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/21-19:12:50
G01     73.5           33.2               12.1 +/-    0.66      19.9 +/-    0.66  0.050 / 0.060
G07     136.1          33.5               12.9 +/-    1.00      21.2 +/-    1.00  0.040 / 0.110
G11     55.8           32.9               10.3 +/-    0.75      17.1 +/-    0.75  0.080 / 0.250
G13     277.5          37.7               14.0 +/-    1.00      21.1 +/-    1.00  0.120 / 0.340
G15     305.0          14.5               10.2 +/-    1.89      25.8 +/-    1.89  0.030 / 0.030
G17     229.0          63.9               14.7 +/-    0.76      16.2 +/-    0.76  0.030 / 0.050
G18     51.1           19.5               10.2 +/-    1.24      22.6 +/-    1.24  0.050 / 0.130
G19     222.6          38.4               15.1 +/-    1.39      22.5 +/-    1.39  0.060 / 0.120
G28     16.0           59.7               10.6 +/-    0.41      12.1 +/-    0.41  0.030 / 0.060
G30     133.0          63.2               14.1 +/-    0.64      15.6 +/-    0.64  0.030 / 0.040