PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/30-21:43:00
G01     45.0           21.1                9.4 +/-    1.30      20.2 +/-    1.30  0.080 / 0.250
G06     176.0          32.6               16.7 +/-    1.32      27.7 +/-    1.32  0.070 / 0.230
G11     43.8           10.4                8.8 +/-    4.07      24.4 +/-    4.07  0.050 / 0.160
G13     243.8          26.3               17.7 +/-    2.81      33.6 +/-    2.81  0.060 / 0.150
G15     277.1          14.2               14.4 +/-    1.69      36.4 +/-    1.69  0.120 / 0.250
G17     327.0          76.0               12.6 +/-    0.85      13.0 +/-    0.85  0.120 / 0.280
G19     259.1          64.2               12.4 +/-    0.75      13.7 +/-    0.75  0.040 / 0.070
G24     318.2          13.9               10.1 +/-    1.27      25.8 +/-    1.27  0.030 / 0.070
G28     63.1           49.7               11.9 +/-    0.70      15.0 +/-    0.70  0.140 / 0.540
G30     152.2          32.9               15.7 +/-    2.01      26.0 +/-    2.01  0.160 / 0.550