PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/15-21:42:50
G01     72.0           33.1               11.9 +/-    1.07      19.6 +/-    1.07  0.110 / 0.130
G07     136.9          32.4               14.7 +/-    1.36      24.5 +/-    1.36  0.120 / 0.090
G11     55.5           32.8               10.0 +/-    1.43      16.6 +/-    1.43  0.070 / 0.060
G13     276.2          37.5               13.9 +/-    1.77      21.1 +/-    1.77  0.090 / 0.070
G15     303.2          15.2                8.7 +/-    1.27      21.6 +/-    1.27  0.060 / 0.040
G17     230.4          63.2               14.7 +/-    1.25      16.3 +/-    1.25  0.060 / 0.040
G18     50.2           19.0               11.2 +/-    1.75      25.2 +/-    1.75  0.080 / 0.190
G19     223.5          40.4               16.4 +/-    1.42      23.7 +/-    1.42  0.170 / 0.240
G28     18.7           59.4               12.6 +/-    1.44      14.4 +/-    1.44  0.030 / 0.010
G30     134.4          60.7               14.4 +/-    0.43      16.3 +/-    0.43  0.030 / 0.010