Interactive data exploration

Scripting is important for memory and/or for automating data processing. However, repeatedly typing the same commands quickly becomes cumbersome in particular when discovering new data. Interactive exploration of data is now available through the following set of commands

          LAS90> file in 12co21-newfmt-base.30m
          LAS90> set source YOUR-SOURCE
          LAS90> set line 12CO(2-1)
          LAS90> set tele 30M-V03-A230
          LAS90> go explore

``go explore'' enables loop visualization of data scan by scan or by offset range (as in section ). It is possible to visualize a 2D image or the average of the observations. Zoom are easily accessible as well as popups of spectra and drifts. An up-to-date summary of the possibility is available by typing input explore. ``go explore'' is best used in conjunction with the possibility to easily select a consistent setup. To do this (i.e. exploring a subset of its input data file), the user must select this setup through the set command because the ``go explore'' script issues many intermediate find commands. Both functionalities (selection and exploration) are merged in the Explore Data File widget of the CLASS90 main menu. Examples are given in Figs.  to .

Figure: Data exploration by selecting Explore Data File from the CLASS90 main menu or by typing go explore at the CLASS90 prompt. Upper right: The 73 dumped spectra of scan 9608. Upper left: Intensity as a function of entry number, in ten contiguous velocity channels centered on the channel shown as the vertical line of the upper right panel. Bottom right: Spectrum corresponding to entry number 19 defined as the horizontal line of the upper right panel. Bottom left: On-line documentation of this interactive tool.

Figure: Data exploration by scan. Left: 2D image of all dumped spectra of the scan. Right: Averaged spectrum computed on all dumped spectra of the scan.

Figure: Same as Fig  except that the displayed data belong to a beta offset range.