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1. If you are starting with parsed data, the mapping file will have 2 columns. If you are working with unparsed data, the mapping file will have 6-column columns. See step 3 below for more information. The six columns that may be part of your file are described as follows:
   
   • All platforms – Raw (level 1) data cannot be mapped; only normalized, processed (level 2) data is acceptable.
   • The required six-column file format uses the following columns:
     
     • Subject ID
     • Sample ID
     • Name of supplemental file (if appropriate, as attached to the experiment in caArray)
     • Probe Header – Name of column header (in the supplemental file) which contains the probe IDs.
     • Value Header – Name of column header (in the supplemental file) which holds the level 2 data.

     • Sample Header– Name of column header (in the supplemental file) which holds the level 2 data.

       Info
       title Last two columns
       Only one of the last 2 columns is used: a single sample per file uses the Value Header column; multiple samples per file used Sample Header column. Unused columns are blank.

       The following figure shows an example multiple sample mapping file in CSV format.

       
2. When you use the mapping file, make sure you use the subject ID for mapping. If the file is human data, the subject ID is the patient ID.
3. Determine whether your data in from caArray is "imported and parsed" or "supplemental". These are the 'Loading Types' referred to in Step 4 3 of Steps for Mapping Genomic Data. Fill in the 2-column or 6-column mapping file according to the following standard:
   
   • Imported and parsed – This mapping file for parsed data has only two columns, Source Subject ID and Subject Sample ID, without a header.

   • Supplemental– Supplemental files comes in two types: "single sample per file" and "multiple samples per file". In either case, only one of the last two columns is used. If the supplemental data format is , single sample per file, the column named "Sample_Header" can be left empty. If the supplemental data format is multiple samples per file, the column named "Value_Header" can be left empty.

     Info
     title Configuring supplemental files
     Supplemental files from caArray for mapping data must be configured appropriately. For information, see Supplemental Files Configuration.

     The following steps use data of either type.

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