PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/27-05:57:50
G01     50.5           25.7                3.5 +/-    2.40       6.8 +/-    2.40  0.040 / 0.050
G06     181.2          20.9                4.6 +/-    1.19       9.9 +/-    1.19  0.040 / 0.050
G07     146.1          12.5                4.8 +/-    1.05      12.6 +/-    1.05  0.120 / 0.190
G11     45.0           16.0                2.5 +/-    1.90       6.1 +/-    1.90  0.080 / 0.150
G13     252.3          30.5                5.5 +/-    1.98       9.6 +/-    1.98  0.020 / 0.020
G15     283.4          16.1                4.5 +/-    0.98      10.9 +/-    0.98  0.020 / 0.020
G17     315.3          78.7                3.9 +/-    0.38       3.9 +/-    0.38  0.250 / 0.100
G19     247.2          60.9                3.9 +/-    0.52       4.4 +/-    0.52  0.080 / 0.100
G28     52.9           52.6                3.3 +/-    1.30       4.0 +/-    1.30  0.110 / 0.150
G30     148.8          39.7                6.1 +/-    0.72       8.9 +/-    0.72  0.130 / 0.180