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SEDs are built and managed in Segments, which are groups of (spectral, flux) coordinates. For example, a spectrum is considered a Segment. The results of a NED SED Service query are also handled as Segment. Photometric points loaded from file, SAMP or from ASDC are managed as individual Segments (i.e. each photometric point is its own Segment). Clicking on a SED in the Open SEDs field will show all the Segments that populate that particular SED. SED Builder shows where the Segment data came from, the recorded RA and Dec of the Segment, and the number of points in the Segment. Segments can be handled separately from other Segments in the SED; users can add, edit, remove, and save selected Segments separately from the SED in which it lives.   \subsubsection{Importing data}  The SED Builder handles SED I/O. As described in Section \ref{sec:everyday_seds}, \ref{sec:overview},  Iris accepts data from a variety of sources, and is lenient on the data format. Figure \ref{fig:data_sources} illustrates that Iris imports data from built-in data archive portals as well as from outside resources like local files, URLs, other VO-enabled applications, and from plugins. Iris natively supports IVOA-compliant FITS and VOTable formats (described in [REFERENCE]). Files in these formats will automatically be added to SED Builder and the visualizer. The Builder can convert ASCII Tables, CSV, Tab-Seprated-Tables, IPAC tables [REFERENCE], SAMP messages, and non-IVOA-compliant VOTable and FITS files into the native format with user input. We provide two file converted forms: (1) the Import Setup Frame, which handles spectrum-style files (i.e. those with columns for the spectral, flux and flux uncertainties), and (2) the Photometry Catalog Importer, which handles photometry catalogs (i.e. files where each column represents a passband and the values represent the fluxes). Users can save their setup options from the Import Setup Frame to a configuration file and automatically read-in files of the same format to Iris via the command line.