PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/30-20:58:00
G01     63.2           31.6               10.9 +/-    0.70      18.5 +/-    0.70  0.120 / 0.370
G07     141.0          25.4               14.1 +/-    1.02      27.4 +/-    1.02  0.090 / 0.370
G11     50.3           27.0                9.2 +/-    2.05      17.3 +/-    2.05  0.060 / 0.100
G13     266.4          36.1               14.7 +/-    1.49      22.9 +/-    1.49  0.050 / 0.100
G15     296.6          16.2               12.2 +/-    2.86      29.5 +/-    2.86  0.060 / 0.130
G17     244.5          70.4               14.0 +/-    0.92      14.8 +/-    0.92  0.060 / 0.130
G18     44.5           15.0                8.8 +/-    2.18      21.8 +/-    2.18  0.040 / 0.060
G19     229.8          47.0               15.2 +/-    1.18      19.9 +/-    1.18  0.030 / 0.050
G28     31.6           57.4               10.9 +/-    0.91      12.6 +/-    0.91  0.090 / 0.190
G30     141.3          53.8               13.7 +/-    0.69      16.6 +/-    0.69  0.080 / 0.180