PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/21-04:28:00
G01     108.6          24.7                4.2 +/-    0.68       8.3 +/-    0.68  0.040 / 0.060
G07     104.4          59.0                5.5 +/-    0.52       6.3 +/-    0.52  0.050 / 0.060
G08     42.1           21.7                2.7 +/-    0.95       5.7 +/-    0.95  0.030 / 0.040
G09     175.6          15.7                6.2 +/-    1.59      15.2 +/-    1.59  0.040 / 0.050
G11     92.4           42.3                4.6 +/-    0.41       6.5 +/-    0.41  0.050 / 0.080
G13     311.7          26.5                4.0 +/-    1.22       7.6 +/-    1.22  0.050 / 0.080
G17     205.1          37.0                6.1 +/-    1.26       9.4 +/-    1.26  0.070 / 0.150
G19     208.5          12.5                4.9 +/-    2.75      12.9 +/-    2.75  0.060 / 0.180
G28     316.2          60.9                3.5 +/-    0.80       3.9 +/-    0.80  0.060 / 0.140
G30     26.1           77.4                4.5 +/-    0.75       4.6 +/-    0.75  0.070 / 0.140