A brief Tutorial of the CLASS Data Reduction Program

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To correct the frequency-switched spectrum for display: LAS> fold * This command is not required for Beamswitch or Total Power Spectra To display the folded spectrum LAS> plot The white plot window should display the NH3 spectrum as follows:
To sum several observations use the following Class commands. You can only sum spectra of the same frequency and observing bandwidth! LAS> find [parameters] LAS> sum LAS> fold LAS> plot *** For Example: *** After the first three spectra are entered into a class.00ddd file, you might follow these commands: Or LAS> find /all LAS> find /number 1 3 A message will print in the input window saying "3 observations found" To list the observations found, type: LAS> list The window will then display the list of three observations in the index, then type: LAS> sum LAS> fold LAS> plot ****************** For a full header list on the output plot LAS> set format long LAS> plot The summing of the multiple spectra will still have the curved baseline seen in the previous plot display. You now want to remove the receiver response from your spectrum by fitting and subtracting a polynomial baseline. At this point you want to select the left and right of the area you DON'T want to include in your baseline fit - such areas would include the edges of the band and the lines. There are several Class commands needed to correct or "flatten" this baseline for a proper display and analysis. LAS> set cursor LAS> set window
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A brief Tutorial of the CLASS Data Reduction Program

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