Question: Why isnt this function plotting properly?

Ok, i am trying to plot the function abs(H)^(1/2) * sign(H). This function should be negative when H is negative, but for some reason the " * sign(H) " is having no effect on the plot, the plot is an even positive function rather than an odd function as it should be.

When I manually evaluate this function with a negative H using maple, a negative value is given back to me, however not in the plot... why is this.

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