PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/04-21:28:00
G01     44.6           20.7               11.1 +/-    1.28      23.9 +/-    1.28  0.070 / 0.180
G06     175.8          33.4               18.6 +/-    1.03      30.4 +/-    1.03  0.080 / 0.210
G13     243.2          25.9               17.5 +/-    2.29      33.5 +/-    2.29  0.060 / 0.160
G15     276.6          14.1               14.7 +/-    1.45      37.5 +/-    1.45  0.070 / 0.180
G17     330.4          75.7               15.4 +/-    0.56      15.9 +/-    0.56  0.130 / 0.310
G19     260.3          64.5               13.9 +/-    0.67      15.2 +/-    0.67  0.150 / 0.340
G24     318.1          14.4               12.5 +/-    1.28      31.4 +/-    1.28  0.040 / 0.070
G28     63.9           49.4               13.6 +/-    0.86      17.3 +/-    0.86  0.040 / 0.080
G30     152.5          32.4               17.6 +/-    1.17      29.4 +/-    1.17  0.070 / 0.100