r - interaction plot, not plotting a particular value -

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i've created interaction plot , realized 1 line breaks in middle , because 2 factors on x axis has no value particular factor, although other factors, has value. looks (assume lines shown connected):

  _ /         _ / 1 2 3 4 5 6 7 x axis

basically there value 4, not 3 , 5 that's why looks does. how correct this? have set factor

i read use na.rm doesn't work , looks same. thanks


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