Question: Log mode of y-axis only goes to 10^-6?

I'm trying to plot a function whose value ranges from ~10^-10 to >1. Using plot with [mode=log] for the y-axis, I find that values below 10^-6 are not displayed. I couldn't find any mention in the help file about this. Is this a hard limit in Maple10?

I realize I can use logplot for this function, as well.

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