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FITS File Summary
The FITS File Summary window shows
information about FITS extensions and higher order data planes with
NAXIS > 2. This window is opened
from a FITS file opening command, such as
Open FITS File, when the FITS file contains more than
one HDU or an HDU with NAXIS > 2. An
image having NAXIS > 2 is often
called a "data dube," even if NAXIS = 4
or higher. Each row of the window lists data for each HDU, and each
plane of an HDU having NAXIS > 2 is indicated by a checkbox near
the right end of the grid. Note: This window is used by several
commands, and it may not show all options in all instances.
Using the FITS File Summary Window
The picture above shows the FITS File
Summary for an image having a primary HDU and 4 additional
extension HDUs. The first HDU is a PRIMARY header that contains
general file documentation and no data array. The other extensions
each contain a data array with 2 planes. Since the leftmost box is
checked for opening the entire HDU, the plane boxes do not need to
be checked. Clicking [Open] results in
displaying eight 2-dimensional images in an
Image Window. Below are tips for using this
window.
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A PRIMARY HDU may or may not have a data array.
If no data array exists, the Dimensions
are listed as [0].
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To open a PRIMARY HDU having no data
array, check the box at the left of the grid to open it in a header
viewing window.
To open a PRIMARY HDU having a data array
(or a classic FITS image having no extensions), check its box at
the left of the grid.
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To select all HDUs and all their planes, tick
the checkbox above the left column heading and choose Planes: Select all planes.
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Specify which planes to open by choosing an
option from thePlanes list box.
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To select specific planes of a specific HDU,
choose Planes: Select specific planes
and tick the checkboxes for the target planes.
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The FITS File Summary opens with all HDUs
containing data checked.
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If the
Open FITS File dialog selects multiple images
or a
File List, the grid lists all images, HDUs, and
planes.
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The  Open
as Image Set option determines whether multiple HDU's and
planes are opened as an
Image Set in one window or into separate windows.
Properties in the Fits File Summary
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Column Heading
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Column Contents
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Check this box in the heading of the left-most
column to select all HDUs beyond the primary HDU.
To select a specific HDU, check its box in the specific row.
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Type
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The first (or only) HDU is listed as
PRIMARY. For the second and higher HDU, the value of
theXTENSION keyword is listed.
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Name
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The first (or only) HDU is listed as
PRIMARY. For the second and higher HDU, the value of the
EXTNAME keyword is listed.
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Object
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Lists the value of the OBJECT keyword.
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BitPix
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Lists the value of the BITPIX keyword.
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Pixel
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Lists the array pixel type indicated by the
BITPIX keyword.
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Dimensions
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Lists the data array dimensions using the values
of the NAXIS1,NAXIS2, NAXIS3, and
higher keywords.
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1, 2, 3, ...
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Select planes to open by ticking for each specific plane. To select all planes, tick
for the HDU, and select Planes: Select all planes.
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Open as Image Set
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Controls whether the selected HDU's (rows) are
opened as an
Image Set in a single
Image Window.
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Planes:
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For HDUs with NAXIS > 2, this list specifies
which planes to open. It does not appear if all HDU's have NAXIS =
2. The options are self explanatory, as follows:
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Select all planes
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Select specific planes
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Select first plane only
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Help
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Click this button to open "Topic Help" for the
Mira Project Manager.
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Related Topics
Contents
Image Windows
Working with FITS Format
Open command
Open FITS File
View and Search FITS Header
Save and Save as Commands
FITS Keywords
Pixel Scale Sensitive FITS Keywords
FITS Header Editor
FITS Header Pane
Modify Keywords
Add Metadata
Mira Pro x64 8.83 User's Guide, Copyright Ⓒ 2026 Mirametrics, Inc.
All Rights Reserved.
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