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Michael,
A logarithmic axis can only plot positive values. There simply is no way to put negative values or zero on a logarithmic axis.
Fundamental: If 10L = Z, then L is the logarithm (base 10) of Z. If L is a negative value, then Z is a positive fraction less than 1.0. If L is zero, then Z equals 1.0. If L is greater than 0, then Z is greater than 1.0. Note that there no value of L will result in a value of Z that is zero or negative. Logarithms are simply not defined for zero or negative numbers.
Considering this as duplicate of Zero values in logarithmic mode draw off chart top?. Hence closing the same.
— Vishwas R Team CanvasJS