Bit of advice; never underestimate your enemy.
It does not appear to be an estimate, but rather an empirical measure. You might want to consider where on the graph the "male" and "female" symbols are relative to the time line. They are in the future. Clearly the range bars for capacity is the only relevant information that was expressed regarding the modern men and women.
Edited by lyx2no, : Speaking too quickly mistakenly referred to them as error bars.
Ridicule is the only weapon which can be used against unintelligible propositions. Ideas must be distinct before reason can act upon them.
Thomas Jefferson
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