PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/23-15:12:50
G01     63.9           31.7                9.9 +/-    1.67      16.8 +/-    1.67  0.040 / 0.030
G07     140.6          25.5                9.4 +/-    1.15      18.2 +/-    1.15  0.040 / 0.030
G11     49.6           25.8                8.6 +/-    1.92      16.4 +/-    1.92  0.050 / 0.110
G13     266.6          36.4               12.9 +/-    1.33      19.9 +/-    1.33  0.050 / 0.120
G15     299.6          14.9                6.7 +/-    2.23      16.6 +/-    2.23  0.070 / 0.100
G17     247.8          74.3               12.7 +/-    0.39      13.2 +/-    0.39  0.090 / 0.130
G18     44.4           14.7                8.7 +/-    1.60      21.8 +/-    1.60  0.090 / 0.080
G19     228.8          44.4               12.5 +/-    2.10      17.0 +/-    2.10  0.070 / 0.090
G28     29.7           57.8               12.1 +/-    0.64      14.0 +/-    0.64  0.130 / 0.280
G30     141.3          56.9               12.1 +/-    0.59      14.2 +/-    0.59  0.130 / 0.310