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: http://www.atnf.csiro.au/computing/software/miriad/doc/puthd.html
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Task: puthd Purpose: Change the value of or add a single header item Categories: utility PUTHD is a MIRIAD task to add or modify an item in the "header" of an image or uv dataset. The item CANNOT be an array or any other complex data structure, it must be a single entity. To modify such complex data structures, specialized programs are available. Key: in The name of an item within a data set. This is given in the form as in the example: puthd in=dataset/item Key: value The value to be placed in the item. Note only single values can be given, no arrays. An optional second units argument can be given to convert the value before the item is stored. Possible units are "degrees", "arcminutes", "arcseconds", "time", "hours", "hms", and "dms" (with mininum match). Times are given in the standard Miriad form and are stored as Julian dates. Angular units are converted if necessary and stored in radians. bpa, being the exception, is stored in degrees. Key: type The data type of the argument. Values can be 'integer', 'real', 'double' and 'ascii'. The default is determined from the format of the value parameter or from the type of the item if it was already present. Normally you can allow this parameter to default. PUTHD will complain when you change the datatype, but otherwise allow you to do so.