PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-16:42:40
G01     52.3           26.6                8.6 +/-    1.19      16.3 +/-    1.19  0.110 / 0.120
G06     178.1          22.9               12.7 +/-    1.01      26.2 +/-    1.01  0.090 / 0.180
G07     144.9          11.6               10.2 +/-    4.50      27.6 +/-    4.50  0.180 / 0.370
G11     44.6           14.4                7.3 +/-    1.69      18.4 +/-    1.69  0.140 / 0.240
G13     255.5          31.7               12.4 +/-    1.40      21.0 +/-    1.40  0.030 / 0.030
G15     290.1          15.3                7.5 +/-    2.23      18.5 +/-    2.23  0.020 / 0.030
G17     314.2          79.6               12.3 +/-    1.59      12.5 +/-    1.59  0.120 / 0.330
G19     243.9          60.0               13.9 +/-    0.96      15.8 +/-    0.96  0.090 / 0.310
G28     48.5           53.8                9.8 +/-    1.36      11.8 +/-    1.36  0.040 / 0.070
G30     148.4          46.7               11.4 +/-    1.36      15.0 +/-    1.36  0.040 / 0.070