1. THE EXCHANGE OF STEC FILES

   gageyyyyddd.stec

     |   |  |   |
     |   |  |   +-- stec:  very precise sample of the actual slant total electron content
     |   |  |
     |   |  +------  ddd:  day of the year of first record
     |   |
     |   +--------- yyyy:  year
     |
     +------------- gage:  research group of Astronomy and GEomatics at Universitat Politecnica de Catalunya



2. STEC FORMAT DEFINITION AND EXAMPLE

+---------------------------------------------------------------------+
|                                                                     |
|             STEC DATA FILE - DATA RECORD DESCRIPTION                |
|                                                                     |
+------------------------------------------------+--------+-----------+
| DESCRIPTION                                    | COLUMN |  FORMAT   |
+------------------------------------------------+--------+-----------+
| - Epoch :                                      |        |           |
|   - year (4 digits)                            |   1    |  I4       |
|   - day of the year                            |   2    |  I3       |
|   - second of day (GPS time)                   |   3    |  I5       |
|                                                |        |           |
| - Station name                                 |   4    |  A4       |
|                                                |        |           |
| - Satellite number with system identifier      |   5    |  A1,I2.2  |
|                                                |        |           |
| - Arc identifier                               |   6    |  I3       |
|                                                |        |           |
| - Elevation (degrees)                          |   7    |  F5.2     |
|                                                |        |           |
| - Line Of Sight unitary vector (X-axis)        |   8    |  F8.5     |
|                                                |        |           |
| - Line Of Sight unitary vector (Y-axis)        |   9    |  F8.5     |
|                                                |        |           |
| - Line Of Sight unitary vector (Z-axis)        |   10   |  F8.5     |
|                                                |        |           |
| - True STEC -> LI = L1 - L2 (meters)           |   11   |  F8.4     |
|                                                |        |           |
| - PI (corrected from DCBs) = P2 - P1 (meters)  |   12   |  F8.4     |
|                                                |        |           |
+------------------------------------------------+--------+-----------+


+------------------------------------------------------------------------------+
|                                                                              |
|                          STEC DATA FILE - EXAMPLE                            |
|                                                                              |
+------------------------------------------------------------------------------+

----|---1|0---|---2|0---|---3|0---|---4|0---|---5|0---|---6|0---|---7|0---|---8|
2014   1     0 abmf G14 223 50.55  0.45708 -0.40419  0.79228   1.4937   1.1897
2014   1     0 acor G02 217 12.02  0.35552  0.93165  0.07506   1.9638   1.8130
2014   1     0 alac G12 207 63.61  0.45091  0.17236  0.87577   0.6754   0.9195
2014   1    30 coco G04 102 21.89  0.02093  0.56589  0.82422   3.1267   2.7516
2014   1    30 cont G06 203 52.42 -0.28921 -0.47064 -0.83358   4.0357   3.9206
2014   1    30 darw G13 209 43.58 -0.98994  0.03244 -0.13769   5.7383   5.9953