PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-14:58:10
G01     105.7          26.0                9.3 +/-    1.51      17.8 +/-    1.51  0.230 / 0.320
G07     110.1          53.8               10.0 +/-    0.83      12.1 +/-    0.83  0.270 / 0.350
G08     41.7           17.7                7.3 +/-    1.59      17.1 +/-    1.59  0.040 / 0.030
G09     173.7          11.7               11.1 +/-    2.75      29.9 +/-    2.75  0.050 / 0.020
G11     84.6           40.4                8.3 +/-    0.93      11.9 +/-    0.93  0.040 / 0.040
G13     310.2          27.7                7.4 +/-    1.91      13.6 +/-    1.91  0.050 / 0.040
G17     205.6          41.3               12.4 +/-    1.22      17.6 +/-    1.22  0.080 / 0.150
G19     209.1          15.5               11.3 +/-    4.05      27.8 +/-    4.05  0.080 / 0.200
G28     319.9          60.9                8.3 +/-    0.70       9.3 +/-    0.70  0.050 / 0.060
G30     15.7           77.4               10.0 +/-    0.71      10.2 +/-    0.71  0.030 / 0.050