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User-defined units are not stored with a document: if you need to transfer a document that uses user-defined units to another system, you should ensure compatibility by including the appropriate unit macros in the document's autoexec script.
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number
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The unit type to be defined: a number between 1 and 12. Units 1 to 7 are PTC ALD default system units.
Any of PTC ALD default units of measurement can be cleared by entering unit followed by the appropriate number and no further parameters. This can make some dialog boxes less daunting.
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abb1
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A two-character string representing the unit abbreviation (e.g. "in" for inches). This abbreviation is used when entering unit measurements in PTC ALD .
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abb2
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An alternative abbreviation for the same measurement: intended for use on non-English systems where the abbreviations need to be translated.
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longname
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The long name of the measurement: a string of up to 12 characters. This name is used in the Document Preferences and Ruler dialog boxes.
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base
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The natural 'divisor' for this measurement. This will be used on rulers for tick marks and to calculate the second part of two-part units.
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two_part_link
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Set a link to the 2nd part of a two-part unit, defined here (e.g. "pc" would link to "pt" and "cc" would link to "dd").
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min
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A minimum size for the unit (in mm): the unit will not be used when in non-strict mode unless it is less than this minimum
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unit_size
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A floating point number accurate to many decimal places which specifies the size in millimeters of the unit.
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