OSD element ASPD VS ASPEED

What’s the difference between OSD element ASPD and ASPEED?

From the mission planner I can see that ASPEED is airspeed value being used by TECS (fused value) whilst ASPD is value directly from my airspeed sensor.

But I still do not get it what is TECS fused speed? What is fused and what is actually displayed? Right now I have both on my OSD but I would like to remove one of them to declutter it. So which one of these is potentially redundant?