PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/27-07:27:40
G01     231.6          22.0                6.9 +/-    2.05      14.4 +/-    2.05  0.040 / 0.040
G03     302.1          61.8                4.0 +/-    0.86       4.5 +/-    0.86  0.030 / 0.030
G14     79.3           30.1                3.6 +/-    0.70       6.4 +/-    0.70  0.080 / 0.150
G16     149.0          39.5                6.0 +/-    0.95       8.9 +/-    0.95  0.080 / 0.170
G18     207.4          11.8                3.0 +/-    2.50       7.9 +/-    2.50  0.050 / 0.100
G22     237.9          74.8                4.0 +/-    0.67       4.1 +/-    0.67  0.050 / 0.110
G23     302.5          33.1                4.6 +/-    1.14       7.6 +/-    1.14  0.030 / 0.050
G26     106.1          51.9                6.1 +/-    0.41       7.5 +/-    0.41  0.040 / 0.050
G31     43.5           36.1                2.0 +/-    0.36       3.0 +/-    0.36  0.120 / 0.180