DTF: Data Text Format
![[NOTE]](../imgs/note.png)
The CIAo Data Model supports a variety of ASCII formats). One of these is the Data Text Format (DTF), which can be thought of as using the FITS concepts of header keywords and data blocks, but with ASCII rather than binary sections for the data.
The following dmcopy call creates a text file src.txt containing the contents of the (presumed FITS format) file src.pi.
unix% dmcopy src.pi "src.txt[opt kernel=text/dtf]"
This file can then be used with other CIAO tools - e.g.
unix% dmstat src.txt"[cols count_rate]"
COUNT_RATE[count/s]
min: 0 @: 1
max: 0.00094852952509 @: 71
mean: 4.3287504051e-05
sigma: 0.00010526767519
sum: 0.044326404148
good: 1024
null: 0
or treated as an ASCII file:
unix% head src.txt #TEXT/DTF XTENSION= "TABLE " HDUNAME = "SPECTRUM" EXTNAME = "SPECTRUM" TFIELDS = 4 TTYPE1 = "CHANNEL " / PI TFORM1 = "1J " / data format of field. TUNIT1 = "channel " / physical unit of field. TLMIN1 = 1 TLMAX1 = 1024 unix% tail src.txt MJDREF = 5.0814000000000E+04 / MJD zero point for times TSTART = 7.9830949184000E+07 / Observation start time (MET) TSTOP = 7.9874795000000E+07 / Observation end time (MET) TIMESYS = "TT " / Time system TIMEUNIT= "s " / Time unit CCD_ID = 0 / CCD for this table END 7.9830989184000e+07 7.9867173869376e+07 7.9867177110326e+07 7.9874771584041e+07