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Error ToF Sensor


I'm working in a project and I need to measure the distance in 3 or 4 points at the same time. I got these values but they are wrong... 

For example, the far objets got the lowest value in mm or similar value to the close objets(there are like 30cm between the close and far objets). However if I measure these objets with aditof script , the values are diferents.

I use distance_map[x,y]  to got the value in mm for all objets changing the point (x,y). How can I get betters values ?