PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/22-18:42:40
G01     88.1           32.3               12.4 +/-    0.76      20.8 +/-    0.76  0.030 / 0.030
G07     127.1          44.4               15.0 +/-    0.82      20.4 +/-    0.82  0.030 / 0.030
G11     67.4           39.6               11.7 +/-    0.49      17.1 +/-    0.49  0.080 / 0.340
G13     292.6          36.4               13.1 +/-    0.78      20.3 +/-    0.78  0.190 / 0.470
G15     314.6          10.4               -7.5 +/-   19.80     -20.7 +/-   19.80  0.040 / 0.060
G17     216.4          52.4               16.4 +/-    0.62      20.1 +/-    0.62  0.050 / 0.070
G18     62.3           23.7               10.1 +/-    1.21      20.3 +/-    1.21  0.070 / 0.090
G19     215.6          27.2               14.7 +/-    0.88      27.3 +/-    0.88  0.060 / 0.100
G28     353.1          61.6               11.2 +/-    1.03      12.5 +/-    1.03  0.070 / 0.140
G30     110.8          74.1               13.3 +/-    1.18      13.8 +/-    1.18  0.050 / 0.140