A link to the data entry menu lives in the upper right corner. Tic the box to transfer data to the text area. icurve and jcurve are respectively indices in the numbering scheme of post-bomb and pre-bomb datasets. If you wish to specify curve smoothing you must specify a pre-bomb curve number. Zero serves as a placeholder for that field but does not invoke a pre-bomb curve. Once you have figured out the calibration curve numbering scheme you can paste data directly into the text area box from a spreadsheet. You should be aware that there is a computational penalty for specifying a pre-bomb curve
Don't specify a pre-bomb dataset (jcurve) for marine data sets (ie Great Barrier Reef and Kure Atoll).