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Sets the preflash length for a CCD.
Format: PREFLASH <channel> <flash-time>
Channel: The name of the data-acquisition channel.
Flash-time: the length of the preflash in seconds.
Examples: preflash aux 0.05
Comments: This command sets the length of the preflash for all subsequent exposures except those started by the bias and multbias commands (for which there is no preflash). Please note that the preflash command itself does not illuminate the CCD; the preflash occurs as part of the following exposure commands.