I am running into an alignment problem in trying to emulate your approach.  If the high/low or starting/ending values do not have the same number of digits, the spark lines vary in length.  This can be partially addressed by forcing the 2 digit decimal point, but I have not found a way to address it with a mix of positive/negative values or if all the whole numbers are not the same number of digits. 

Is there a way to control the width of the chart area and align it with the other charts?  ...this is without discarding the high/low and beginning/ending values.

Thank You,