I have an SEC column made from the 90's its a TSKgel G4000PW I have been checking the company's web site trying to find the calibration data I have found some data of the G4000PW series however they are all 17 micron average particle size mine is a 13 micron column also all the data appears to be from 60cm columns mine is only 30 cm long. Does anyone out there know if this literature is still available or if there is anyway of modifying the data given by the company to fit the column I'm using?