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Zoom subroutine

Zoom subroutine

ZO — Zoom expansion subroutine

This routine allows the spectrum to be expanded horizontally for more detailed viewing. The subroutine can be entered by typing ZO or Zoom on the command line or by double-clicking with the left mouse button. When in the subroutine, "Zoom" is displayed on the gray status bar, and the cursor changes to a small cross-hair. As with all subroutines, typing <ENTER> exits the subroutine.

To select a region for expanded display, press and hold the left mouse button and drag to highlight the chosen region, then release the mouse button. The display can be toggled from Full to Expanded by clicking the right mouse button, or by typing Ctrl-F and Ctrl-E, respectively.

Be careful not to click the left mouse button when selecting a region – that is equivalent to selecting a region consisting of 1 point. The resulting expanded display will be confusing.

Once a region has been defined, the display can be toggled between Full and Expanded from the base level of the program using Ctrl-F and Ctrl-E, respectively. These commands are also available from the View menu.

While in the Zoom subroutine, the left and right arrow keys will scroll the display window left and right.

While in the Zoom subroutine, typing F displays the dialog box shown below, in which exact frequency limits can be entered. The limits can be set by data point number, Hz or ppm.

It is possible to enter exact limits for the expanded display using command line arguments, as follows:

zo setpts n m – where n and m are numbers corresponding to the first and last data points of the chosen region

zo setppm n m – where n and m are numbers corresponding to the chemical shift range, in ppm, of the chosen region

zo sethz n m – where n and m are numbers corresponding to the chemical shift range, in Hz, of the chosen region

Other allowed command line arguments are on and off, corresponding to expanded or full display, respectively.

Any of these commands can begin with Zo or Zoom.

Z0 – Z9 — Setting Zoom Regions

Up to 10 sets of zoom limits can be defined, making it easy to jump to the desired expanded display. The limits can be set in Hz, ppm or data point number. Regardless of which units are used to define the limits, they are saved by the program in ppm. These commands apply only to dimension 1.

The easiest way to set zoom regions is to display the desired region, and then assign it a number. This is done by typing a single digit while in the zoom routine. All defined zoom regions can be cleared by typing C while in zoom.

Once the limits of the zoom region(s) have been established, the display can be set to the corresponding limits using one of the commands z0, z1, z2,…z9.

The limits can also be set using one of the following commands, which can be used in macros:

z# ppm n m – where n and m are numbers corresponding to the chemical shift range, in ppm, of the chosen region, and # is a number from 0 to 9

z# hz n m – where n and m are numbers corresponding to the chemical shift range, in Hz, of the chosen region, and # is a number from 0 to 9

z# pts n m – where n and m are numbers corresponding to the first and last data points of the chosen region, and # is a number from 0 to 9

Last updated: 6/22/08