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Is there a site that allows you to give the approximate specs of a set of magnets and then it produces the graph of the magnetic field for you?

Here is a situation I try to understand:

I have a set of rectangular magnets about 1*0.75*.25 inches with north and south on large faces. The magnets are glued in two long lines (like dominoes) about 1 inch apart, all north sides are up. In the area between the magnets there is a strong magnetic field, as if a magnet with opposite polarity is in that places (as if a south pole is there). Why does that happen?

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