PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/06/28-18:57:50
G02     203.8          34.4               15.3 +/-    1.32      24.5 +/-    1.32  0.190 / 0.190
G06     154.3          70.7               13.3 +/-    0.79      14.0 +/-    0.79  0.080 / 0.130
G12     308.7          17.9               11.2 +/-    2.16      26.0 +/-    2.16  0.070 / 0.080
G17     35.6           49.6               11.5 +/-    1.05      14.6 +/-    1.05  0.060 / 0.100
G19     356.5          65.9               11.7 +/-    0.34      12.7 +/-    0.34  0.030 / 0.040
G24     296.4          39.0               12.2 +/-    3.23      18.0 +/-    3.23  0.030 / 0.040
G28     103.1          30.8               12.0 +/-    1.00      20.7 +/-    1.00  0.030 / 0.040