the tank. Once past that shape's peculiarity, switch back to the previous volume of
portions.
Let's imagine that you do the tank calibration with portions of 10 liters just like
before. The level gets to some peculiarity of the tank's shape.
You reduce the portions' volume from 10 to 5 liters. And keep adding the
portions until the level is above the problematic part.
Fig. 39 Reducing portions' volume
Fig. 40 Switching to previous portions' volume
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