PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/22-19:42:50
G01     56.0           28.9                9.4 +/-    0.66      16.9 +/-    0.66  0.040 / 0.060
G07     144.0          18.9               14.4 +/-    2.29      32.5 +/-    2.29  0.040 / 0.070
G11     46.9           21.2                9.2 +/-    1.23      19.6 +/-    1.23  0.080 / 0.340
G13     257.9          33.6               13.5 +/-    1.88      21.9 +/-    1.88  0.080 / 0.370
G15     290.6          16.1                9.5 +/-    2.01      23.1 +/-    2.01  0.090 / 0.240
G17     268.2          76.0               12.5 +/-    0.63      12.9 +/-    0.63  0.100 / 0.270
G18     40.2           10.5                9.1 +/-    2.06      25.1 +/-    2.06  0.090 / 0.280
G19     236.9          52.7               13.5 +/-    0.96      16.5 +/-    0.96  0.090 / 0.260
G28     42.6           55.2               10.9 +/-    0.87      13.0 +/-    0.87  0.050 / 0.070
G30     146.2          47.5               14.1 +/-    0.58      18.3 +/-    0.58  0.060 / 0.060