By Plot-exponential-decay.png: PeterQ derivative work: Autopilot (Plot-exponential-decay.png) [CC-BY-SA-2.5-2.0-1.0, CC-BY-SA-3.0 or GFDL], via Wikimedia Commons
By Plot-exponential-decay.png: PeterQ derivative work: Autopilot (Plot-exponential-decay.png) [CC-BY-SA-2.5-2.0-1.0, CC-BY-SA-3.0 or GFDL], via Wikimedia Commons