A function which consumes a zoo object where there are lots of events (as columns). The contents are all levels. For each column, the event date value is set to 100 and all other values are scaled accordingly. It's input is a zoo object which is the first component of the list returned by phys2eventtime.
z is a zoo object containing input data from phys2eventtime.
The function returns a zoo object which has been rescaled.
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