trident.line_database.LineDatabase.parse_subset

LineDatabase.parse_subset(subsets='all')[source]

Select multiple lines based on atom, ion state, identifier, and/or wavelength. Once you’ve created a LineDatabase, you can subselect certain lines from it based on line characteristics. Preferred to use this method over select_lines.

Will return the unique union of all lines matching the specified subsets from the LineDatabase.

Parameters

Subsets

list of strings, optional

List strings matching possible lines. Strings can be of the form: * Atom - Examples: “H”, “C”, “Mg” * Ion - Examples: “H I”, “H II”, “C IV”, “Mg II” * Line - Examples: “H I 1216”, “C II 1336”, “Mg II 1240” * Identifier - Examples: “Ly a”, “Ly b”

If set to None, selects all lines in LineDatabase. Default: None

Returns

Line subset

list of trident.Line objects

A list of the Lines that were selected

Example

>>> # Get a list of all lines of Carbon, Mg II and Lyman alpha
>>> ldb = LineDatabase('lines.txt')
>>> lines = ldb.parse_subset(['C', 'Mg II', 'H I 1216'])
>>> print(lines)