Once you click on your new spectrum, NMRViewJ gives you two sets of cursors, black and red (Figure 3.13, “Key features of the Spectrum Window”). The chemical shift positions of the black and red line-cursors are shown (in ppm) in the Spectrum Window's Cursor Information displays (Figure 3.14, “Cursor information displays.”), and so are the horizontal and vertical separations between the cursors (in Hz). You can move each of the four cursors independently by clicking on or near them and dragging them. You can also move them like crosshairs by clicking on or near their intersection. One neat thing about NVJ is that you can treat each corner of the bounded area like a moveable crosshair, even if it's a mixture of one black and one red cursor.

NVC users will notice right away that the center button no longer has the function it used to. In NVJ, the left button can be used for all the cursor selections. The center button, however, does have a useful new function. If you have just moved one crosshair (red, black, or mixed) with your left cursor, you can move your mouse pointer (no buttons held down) to a location, then center-click to move that crosshair to the new position.

Figure 3.14. Cursor information displays.

You should really just play around with the cursors for half a minute or so to get a feel for them, particularly for how near is "near enough" for selecting a cursor or crosshair. H. Orient yourself with respect to the Spectrum Window buttons