Four markers are needed. Markers 1 AND 2 must correspond to the i=0 range; markers 3 AND 4 to the i=ilim range. When all four markers are defined, and markers 1 and 2 and markers 3 and 4 are not equal, the baseline can be calculated.
3or 4 at any time. In the former case, the number of the marker about to be set is given on the top left corner of the main window. Use the left button to set this marker or change its position, the right button to leave it unset or unchanged. You are then asked for the position of the following marker. The idea is to first input the four markers in order by clicking four times when the cursor is at the correct position (starting from the i=0 range), and then modify their positions using the numerical keys until you like the result.
x, the marker type switches between Smooth and eXact for subsequent markers. (See definitions of marker types here).
vto quit replacing the data with data/baseline.
uto qUit, subtract base line, and save the base line in the file
base.dat(the file is overwritten if it exists already!).
qto Quit and subtract base line.
The value of the limiting current and the name of the buffer you were baseline subtracting are written in the output file.
Christophe Leger 2009-02-24