RANGE_MINIMUM is an optional numeric field.  

If the salary range is defined by a fixed range, this field identifies the minimum value of that range. 

If the salary range is defined by a formula, this field holds the percent that will be used to calculate the minimum value of the range. The formula used to calculate the minimum value of the range is as follows:

Range Min = (Base Amount + (Dollar Per Point x Evaluated Points)) x Minimum %