Epoch Folding 2 Series and Hardness Ratio (Application)
Application ef2 produces a folded light curve of two series of data, and calculates and plots in various ways their hardness ratio (Series 2/Series 1). It is run in the Question/Answer user interface by typing:
[n]Xronos> ef2in the Partial Question/Answer user interface by typing:
[n]Xronos> ef2 [series1] [series2]and in the Command-Driven user interface by typing:
[n]Xronos> ef2/period=X[/qualifier1/qual2/... etc] [series1] [series2]where the /period= qualifier specifies the period over which the data are folded (in seconds if X>0 or days if X<0).
There are two important input parameters for folding applications: the epoch and the period over which the data will be folded. In folding applications the newbin time corresponds to the time duration of a phase bin in the folded light curve. This is determinated by the chosen number of phasebins per period. The default is such as to produce a folded light curve with 128 phasebins at maximum. The newbins per interval, together with the newbin time, determines the length of the time axis (an ``interval") over which each folded light curves is accumulated. Folded light curves from different intervals can be averaged in one or more frames. The default is to produce one frame only. The reason for averaging folded light curves from different intervals in a frame is to work out the error bars in the folded light curves from the standard deviation of the mean values of each phase bins. To calculate the error bars in this way global parameter number 9 (default =5) must be smaller than the specified number of intervals per frame.
If a phasebin is rejected in any of the series, after folding the corresponding phasebins of the other series are also rejected. The default is to plot the folded light curve of series 1, series 2 and their hardness ratio vs. phase (two cycles are plotted). By specifying the relevant plot options the hardness ratio can be plotted vs. series 1 , vs. series 2, vs. series 1+2, or removed altogether.
The analysis normalisation flag, specified by global parameter number 11 has the same meaning as in application ef1.