Download VIRGO Data Display Users`s Manual

Date : April 29, 2009
Page : 3
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Introduction
The output of the Virgo Online Acquisition is numerical data structured as Frames [?].
Those frames contain raw data (for instance ADC values) as well as processed data (h
values, results of online monitoring or online analysis, ...). To view and plot such data,
the VIRGO experiment uses the dataDisplay software described in this note.
The data Display gives the possibility to dump data, to hear the data, to plot the
data, to select the data to be viewed, to edit plots and superpose them. It uses a simple
Graphical User Interface (Xforms GUI) and the graphical capabilities of a standard tool
used at CERN (ROOT):
• Xforms [2] is a light and quite easy GUI: a free software with many useful GUI
objects and a convivial GUI designer.
• The graphical tools of ROOT [4] are used to view the plots. We have added specific
features like multizoom, start GPS time, superposition of reference plots or export
of the plots data in ASCII files.
Figure 1 shows an example of the plots made by the dataDisplay:
Figure 1: Example of plots made by the Virgo Data Display.
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2.1
User’s Manual
Starting dataDisplay
Command is just dataDisplay, once you got the Virgo environment. When starting
dataDisplay, you can provide optional arguments: