# Single detector maps

## Introduction

There are no single detector maps in the first release.

This section will serve for later releases.

Maps for single detectors are built for full or part of the mission and are used primarily for characterization purposes: while the ones built with an unpolarized detector have a scientific value, the ones built using a polarization sensitive one have little, since, among other things, the polarization angle varies around the sky. Each signal map will be accompanied by a hit map and a variance map. All maps are in Healpix format, with Nside of 2048 for and of 1024 for , in Galactic coordinates, and Nested ordering. The three maps will be packaged into a files with a single BINTABLE extension containing a table of three columns; the structure of the file is given in the FITS file structure section below.

The filenames are of the form {H|L}FI_{detname}_nnnn_yyyymmdd_{type}_{mission}.fits, where detname is a detector identifier, and nnnn is the Healpix Nside of the map, the optional type indicates the subset of input data used, and mission indicates the coverage period, i.e., full, nominal, or survey_n (; an alternative of the type {H|L}FI_detname_{type}_{mission}_Rn.mm.fits is being considered, where Rn.mm is the release number). A full list of products, by their names, is given in the List of products below. These

### HFI(Planck) High Frequency Instrument Processing

See Frequency Maps section

TBW

None

TBW

## FITSFlexible Image Transfer Specification file structure

The file structure is like that of Intensity-only frequency maps as described in the next section

A typical header for the extension is

XTENSION= 'BINTABLE'           / binary table extension
BITPIX  =                    8 / 8-bit bytes
NAXIS   =                    2 / 2-dimensional binary table
NAXIS1  =                   12 / width of table in bytes
NAXIS2  =             50331648 / number of rows in table
PCOUNT  =                    0 / size of special data area
GCOUNT  =                    1 / one data group (required keyword)
TFIELDS =                    3 / number of fields in each row
TTYPE1  = 'I_Stokes'           / label for field   1
TFORM1  = '1E8     '           / data format of field: 4-byte REAL
TUNIT1  = 'K_CMBCosmic Microwave background   '           / physical unit of field
TTYPE2  = 'Hits    '           / label for field   2
TFORM2  = '1J      '           / data format of field: 4-byte INTEGER
TUNIT2  = 'none    '           / physical unit of field
TTYPE3  = 'II_cov  '           / label for field   3
TFORM3  = '1E8     '           / data format of field: 4-byte REAL
TUNIT3  = '(K_CMBCosmic Microwave background)^2'          / physical unit of field
EXTNAME = 'CH-MAP  '           / name of this binary table extension
FREQ    = '857     '
PIXTYPE = 'HEALPIX '
COORDSYS= 'GALACTIC'
ORDERING= 'NESTED  '
FILENAME= 'HFI(Planck) High Frequency Instrument_857-2_2048_20120210_nominal.fits'
NSIDE   =                 2048
CHANNEL = '857-2   '
FIRSTPIX=                    0
LASTPIX =             50331647
EXTVER  = '1       '
PROCVER = 'v50     '