Other option could be using graph builder and getting formula from smoother:
1. Change Curve modeling type to nominal
2. Create smoother graph with Curve as overlay and change settings to fit the lines
![jthi_1-1647154737145.png jthi_1-1647154737145.png](https://community.jmp.com/t5/image/serverpage/image-id/40778i33161377013FB22B/image-size/medium?v=v2&px=400)
3. Click on the red triangle on Smoother and select Save Formula
4. Now you should have a formula in your data table
![jthi_0-1647168242416.png jthi_0-1647168242416.png](https://community.jmp.com/t5/image/serverpage/image-id/40779i2635BBFF85B880D0/image-size/medium?v=v2&px=400)
5. With the formula you could then add "missing" voltage values for Curve 1 (add new rows to data) and then create final Current column which would have your original values from Current(A) and then missing values replaced with the Smoother columns values
Edit:
I would also suggest out checking out Fit Y by X platform
-Jarmo