PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/30-04:57:30
G01     73.4           33.1                3.7 +/-    0.94       6.0 +/-    0.94  0.050 / 0.080
G07     136.1          32.7                6.9 +/-    1.30      11.5 +/-    1.30  0.040 / 0.090
G11     56.2           32.8                2.9 +/-    1.36       4.8 +/-    1.36  0.090 / 0.110
G13     278.7          37.2                5.0 +/-    0.84       7.7 +/-    0.84  0.080 / 0.090
G15     303.9          15.3                1.4 +/-    1.67       3.5 +/-    1.67  0.070 / 0.160
G17     230.1          67.6                6.5 +/-    0.55       7.0 +/-    0.55  0.070 / 0.150
G19     222.7          41.1                7.6 +/-    1.74      10.9 +/-    1.74  0.040 / 0.020
G28     17.0           59.5                4.1 +/-    1.20       4.7 +/-    1.20  0.040 / 0.020
G30     132.7          61.5                6.2 +/-    0.26       7.0 +/-    0.26  0.050 / 0.070