Swarm L2 FAST TEC (Total Electron Content) data are now available on the Swarm dissemination server at the following path:

• /Fast/Level2/TEC

FAST TEC shows strong co-relation with the operational TEC (OPER) for relative TEC. Minor discrepancies in absolute TEC may occur due to differences in Differential Code Bias (DCB) calculations. While OPER computes DCB over a 24-hour period, FAST uses a 12-hour window, which can lead to occasional variations.