Considering the data from three columns, Set/front of the tool/rear of the tool, You should knowing whether or not there is a loss between the front (input) and the back (output) of a test tool. There have been reports that the output is often lower than the input.Provide a plot so that you can easily see the data that answers the questions.

- Is the front always higher than the rear? provide a plot that proves/disproves this

- Is the difference a function of the set point (is it the same for low settings as for high)? provide a plot that proves/disproves this

- Is the difference in % the same across the range of set points? provide a plot that shows this.

- Calculate the efficiency {1 - ((`front of the tool` minus `rear of the tool`)/`front of the tool`) } for each row. provide a plot that shows whether this efficiency loss is the same across the range or not.

set	front of the tool	rear of the tool
4000	4171	4138
4000	4133	4096
4000	4097	4060
4000	4109	4071
4000	4112	4075
2000	2084	2073
2000	2075	2064
3000	3118	3099
3000	3118	3098
5000	5121	5049
5000	5085	5016
6000	6063	5953
6000	6071	5964
5500	5613	5527
3500	3641	3614
4000	4081	4045
6000	6055	5952
1000	1052	1049
5000	5124	5056
3000	3075	3054
1500	1545	1536
2500	2594	2575
4500	4563	4516
2000	2070	2057