To load a GC-MS or LC-MS file to a Chromatogram Processor window:

1. Press the Chromatogram Processor button on the speed bar or choose the File | Open | GC/LC/MS menu item.

2. After an Open GC/LC/MS File window appears, select the appropriate file type and the extension in the Files of type combo box.

3. Choose the file you want to open and click the Open button.

Mass Frontier allows you to open chromatograms with up to 30 000 scans. If you open a file that contains more than 30 000 scans the chromatogram will be displayed up to the retention time corresponding to scan No. 30 000. The rest will be ignored and will not be displayed. The program does not allow the opening of GC/LC/MS files from CD-ROM. If you have files on a CD-ROM, you need to copy these files to the hard drive in order to make them accessible for importing. In addition the file attribute “Read Only” must be disabled.

To change the file attribute:

• Select all the files whose attributes you wish to change In Windows Explorer

• Click the selected files with the RIGHT mouse button and a pop-up menu will appear

• Select Properties in the pop-up menu

• Check out the Read Only attribute check box that is located at the bottom of the Properties dialog window

Mass Frontier comes with a GC/MS and an Xcalibur® MS demonstration files, which are located in the ../HighChem/Mass Frontier 50/Chromatograms directory.

Xcalibur® is a registered trademark of Thermo Electron.