PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/23-16:28:00
G07     357.9          65.3               11.9 +/-    0.93      12.9 +/-    0.93  0.030 / 0.070
G08     76.2           52.6               13.3 +/-    0.57      16.2 +/-    0.57  0.030 / 0.050
G09     181.3          57.5               14.2 +/-    1.23      16.5 +/-    1.23  0.050 / 0.060
G11     136.5          22.6               13.8 +/-    1.40      28.5 +/-    1.40  0.050 / 0.070
G23     157.8          22.8               13.2 +/-    1.76      27.3 +/-    1.76  0.040 / 0.040
G27     43.8           22.2                9.7 +/-    1.64      20.3 +/-    1.64  0.050 / 0.070
G28     251.0          40.8               15.6 +/-    1.42      22.4 +/-    1.42  0.070 / 0.180
G30     314.5          45.8               11.5 +/-    0.95      15.3 +/-    0.95  0.080 / 0.210