Window menu

Update All ( U):

Will update all open windows to reflect the current selection of demag steps. This is the fastest way to see the choices made in the Data List window reflected in the other sample-related windows (Zijderveld, Equal Area, and J/J0 Plot). This also forces refreshes of sample-related windows.

Data List:

Produces a window showing all the demag steps of the current sample. Demag steps that have been selected are highlighted (white on black). Steps can be selected (or deselected) either by clicking on them when this window is active or typing the letter appearing at the left of the line. Contiguous groups of steps can all be selected or deselected (the choice depends on the whether the first point is selected or deselected) by typing the first step's id letter, a dash, and then the last step's id letter (e.g., A-H or X-b) or by "dragging" (clicking down on one step and then moving the cursor to the last step without releasing the mouse button until the last step is reached) over the steps desired. Selections can also be made using the mouse in the Zijderveld or Equal Area windows

Zijderveld:

Produces a window with a Zijderveld plot using the currently selected demag steps. The coordinates reflect the choices checked in the View menu (see below) and can be changed in that menu. Portions of the window can be "zoomed" and points identified as described in the tutorial section and under window tricks, below.

Equal Area:

Produces a "progressive equal area" plot with the currently selected points connected by lines in the order of demagnetization. The first demag step plotted has a "B" (for beginning) up and right from it (this would be the NRM in many instances). Portions of the window can be "zoomed" and points identified as described in the tutorial section and under window tricks, below.

J/J0 Plot:

Produces a "J/J0 plot" of the currently selected steps. The solid line is the percentage of the summed magnetization removed still present at the demag step, while the shaded rectangles are the derivatives of the solid line and are scaled as J/d, where d is the difference in demag level between two demag steps (e.g., °ree;C or Oersteds (emus)). Changes in demag type (from AF to TT, for example) are marked by a vertical line. The horizontal axis is scaled linearly with the demag level and becomes cumulative if different demag levels are combined. For example, if demag steps from NRM to AF500 are followed by thermal steps to TT500, the transition from AF to TT will be exactly halfway across the plot even if the first thermal step is TT250. That TT250 step would be plotted 3/4 of the way across the plot and the d used in making the rectangle between the AF500 and TT250 step would be 250 (which is rather arbitrary but the best we've devised so far). NOTE that the J0 is computed by summing the stepwise demagnetizations between the steps selected. Thus, if a bad measurement at TT475 has a large measured magnetization and is not selected, there will not be a jump in J/J0 between TT450 and TT500 if they have nearly the same magnetization, while there will be a significant drop if it is selected. The value of J0 and the maximum value of J/d are displayed at the bottom of the plot. Another variation of this plot is described under "Component J/J0..." under the View menu. Values calculated in the J/J0 window may be saved using "Save As..." in the File menu.

Info:

Produces a small window displaying the locality title, latitude and longitude, magnetic declination, the current sample, and the current sample's stratigraphic level, bedding and core plate orientation, sample mass or volume, and comment.

Least Squares Equal Area...:

First produces a dialog box where the user can select those least squares fits desired, then produces the equal area plot with the desired data. Typing the ID of a direction type in the "ID" field and then pressing the "Select These" button causes all directions with the same ID to be selected. The ID field is insensitive to case and spaces. The ID of a direction type is the combination of the direction type (usually L, P, or C) and the three letter ID input by the user when the least squares direction was calculated. Portions of the window can be "zoomed" and points identified as described in the tutorial section and under window tricks, below. See the statistics section below for further information on the statistics used and the statistics menu description for what statistics can be used.

Locality Equal Area...:

First produces a dialog box where the user selects the demag step(s) and sample(s) desired; "All" and "Clear" buttons beneath each scrollable pane permit quick changes to the entire pane. Steps or samples are selected/deselected as in the similar Data List window (except no letters are supported here). Once approved, the selected data and statistics are plotted. Portions of the window can be "zoomed" and points identified as described in the tutorial section and under window tricks, below. See the statistics section below for further information on the statistics used and the statistics menu description for what statistics can be used.

NOTE: Presently this code uses a file with the suffix ".STEP" as a guide for listing the demag steps available when using the Locality Equal Area plot. This file is created when the locality is openned if not already present; if present it is not modified. If you use this code and have created a .STEP file, and have then updated the sample data with additional demag steps, you must use the "Remake .STEP" option before using the Locality Equal Area option or you will not be able to plot the new demag steps using the "Locality Equal Area" plot option. This doesn't affect the availability of new steps for any other plot.

NOTE: Although the .STEP file will reflect changes in order (i.e., it might have AF steps, then TT steps, then the same AF steps again if some samples were AF demagnitized before thermal treatment and some were AF demagnetized after thermal treatment), selecting a single demag step will result in ALL steps at the same demag level being selected, regardless of their position relative to other demag steps (e.g., for the AF/TT/AF example, selecting the second AF 50 would result in both AF 50's before TT and AF 50's after TT being selected). Multiple steps with the same demag id for the same sample (not a good practice) can only be selected by selecting the multiple steps in the dialog box.

Least Squares Strat Plot...:

Produces a dialog box permitting selection of available least squares directions. The selected directions are sorted by their associated sample's demag levels (or position in the .SAM file, if "Level = file position" option checked in the StratPlot menu), and the directions are plotted, with positive values up (unless "positive up" option is unchecked), in three columns: Declination, Inclination (or paleolatitude if " Incl = paleolatitude" option is checked or VGP latitude if the "Incl = VGP Latitude" option is checked), and Error Angle. Points are plotted as hollow circles unless the "Shade Normal" option is checked and the inclination (or paleolatitude) is > 0; those points are plotted as solid points in all three columns. The range of the declination and Error Angle panes and the maximum and minimum stratigraphic levels can be set in the "Ranges..." dialog box in the StratPlot menu, permitting the appearance of these panes to be customized. (Points horizontally outside the selected ranges are plotted just outside the pane edges). Points can be identified and the window zoomed as described under the "Window Tricks" section.

Locality Strat Plot...:

Produces a dialog box permitting selection of available samples and demag steps. Note that selecting multiple demag steps will probably produce undesireable results. The selected directions are sorted by their associated sample's demag levels (or position in the .SAM file, if "Level = file position" option checked), and the directions are plotted, with positive values up (unless "positive up" option is unchecked), in three columns: Declination, Inclination (or paleolatitude if " Incl = paleolatitude" option is checked or VGP latitude if the "Incl = VGP Latitude" option is checked), and Moment. Points are plotted as hollow circles unless the "Shade Normal" option is checked and the inclination (or paleolatitude or VGP latitude) is > 0; those points are plotted as solid points in all three columns. The range of the declination and moment panes can be set in the "Ranges..." dialog box, permitting the appearance of these panes to be customized. (Points outside the selected ranges are plotted just outside the pane edges). Points can be identified and the window zoomed as described under the "Window Tricks" section.

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