Hi Mladen!
Thank you for posting this! I was wondering if you have an MT4 version that can display as a histogram (and possibly has alert option on color change)? - I was able to modify this mq5 version that you posted here. However, I use MT4 for trading, not MT5. I found your mq4 indicator "kalman filter 2.1 velocity (separate window)" on forex-station, but it is not clear to me how to modify it to display as a histogram, as the code is different, and I am not skilled in coding. I'm not sure if this is the appropriate place to ask?
Many thanks, by the way, for all the work you do on these indicators, and for sharing them. I've been following your work for many years now, across various sites.

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Kalman filter velocity:
Kalman filter velocity
Author: Mladen Rakic