Let's fit the linear baseline
[Spectrum: BASELINE]

This TASK is to subtract the baselines by polynomial or sin & cos fitting from raw spectra.

* NOTICE:: Spectra will be appended if the name of the output file already exists.

* USAGE:

1. Starting BASELINE

Click [BASELINE] on Button Panel. The following parameter window appears.

< Parameter window for BASELINE >

2. Setting up parameters

Type file name in "Spectrum file(in)" or select a file from [File List]. Usage of [File List]
Specify file name for output in "Spectrum file(out)", and set extension to 'BASE'.
Set "Function" to 'polynomial'.
Type "1" in the first box in "Order/wave num.", "0" in other boxes.
Set "X-axis mode" to 'velocity(km/s)'.
Set "Rest Frequency" to 'from header'.
Set "X-axis range" to 'all range'.
Set "Y-axis" to 'Ta*(K)'.
Set "Y-axis range" to 'auto'.
Set "Execution Mode" to 'Interactive'.
Click [All sp.#] at <Spectrum Window>. Usage of <Spectrum Window>

3. Execution

Click [Exec] in the menu bar, and select [Activate program] from the pull-down menu. The following TTT window appears.
Click [SetRanges] in the menu bar and select [Okay, <SetRanges>]. "Select an option." at the head of the window changes to "set left range".
To specify base range, click the left side of a range with no emission. A vertical line is shown, and "set left range" changes to "set right range".
Click the right side of the range. The second vertical line is shown, and "set right range" returns to "Select an option.". If you want to specify other base ranges, repeat from No.2 to No.4. The spectrum after setting ranges is shown below.
Click [GO] in the menu bar and select [Okay, <GO>]. A best fitted baseline is shown with a red line.
To show subtracted result, click [SHOW] in the menu bar and select [Result]. Color of a spectrum changes to red, and rms of ranges are shown.
When you save the parameters, click [Save&Next] in the menu bar and select [SaveAndNext]. If you finish saving the result of all spectra, "Select an option." changes to "task ended".