If these are caps, ferrite beads, some film resistors...your component supplier
has a preheat specification that must be met or the part will fail in the field.
On many machines, especially those with less than 5 feet of preheat or solder
temperature greater than 475 F, this will result in a very tight wave profile.

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Subject: [TECHNET] wave profile needed
Author:  "MIKE J. LOPEZ" <[log in to unmask]> at INTERNET