# Plain Text¶

Text files should be of the form:

wavelength flux err
3637.390 0.314 0.000
3638.227 0.717 0.000
3639.065 1.482 0.000


where there ‘err’ column is optional but the others are not. The most basic spectrum file allowed would have no header and two columns, e.g.:

1  0.5
2  1.5
3  0.1


If the X-axis is not monotonic, the data will be sorted so that the X-axis is in ascending order.

## API¶

Routines for reading in ASCII format spectra. If astropy.io.ascii is not installed, will use a very simple routine for reading in the data.

pyspeckit.spectrum.readers.txt_reader.open_1d_txt(filename, xaxcol=0, datacol=1, errorcol=2, text_reader='simple', format=None, **kwargs)[source] [github] [bitbucket]

Attempt to read a 1D spectrum from a text file assuming wavelength as the first column, data as the second, and (optionally) error as the third.

Reading can be done either with astropy.io.ascii or a ‘simple’ reader. If you have an IPAC, CDS, or formally formatted table, you’ll want to use astropy.io.ascii and specify a format.

If you have a simply formatted file of the form, e.g. # name name # unit unit data data data data

kwargs are passed to astropy.io.ascii.read

pyspeckit.spectrum.readers.txt_reader.simple_txt(filename, xaxcol=0, datacol=1, errorcol=2, skiplines=0, **kwargs)[source] [github] [bitbucket]

Very simple method for reading columns from ASCII file.