The precision one can achieve depends pretty much on the quality of the plot and of course on how careful the scan is performed. For a high quality plot and a carefully conducted scan the precision is realistically not better than the equivalent of approximately one pixel. To get a feeling on the achievable precision select View->Current Precision. The information dialog that pops up displays the current precision corresponding to +/- one pixel in every direction. For logarithmic axis the uncertainties will be of course asymmetric. Although not a perfect estimate, the values shown should give you a feeling on the precision of the scan and how serious you should take the obtained values. This is not applicable for heavily distorted plots.
Coordinates and measured/scanned values are displayed with in the 'g' format meaning either as plain decimal numbers [-]9.9 or in exponential form [-]9.9E[+|-]999, whichever is the most concise. Once the markers are all set, xyscan sets the "precision" of the displayed numbers to a reasonable value. In the exponential format the precision represents the number of digits after the decimal point. In the standard form the precision represents the maximum number of significant digits (trailing zeros are omitted). The number of significant digits can be changed with the Edit->Significant Digits
menu item. If the Measure Tool is used and no markers are set the number of significant digits is fixed at 6.
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You can save the data collected in a various formats
using File->Save.
A file dialog allows you to specify file name and location of the file to
be created. The extension determines the format. Default is a text file (*.txt
). Her the data is written in a simple
self-explanatory format (table) preceded by a header that contains time
and date, source file, user comments (see below) and other useful
information. Alternatively you can store the data in form of a ROOT
macro (file extension .C) or as a cvs file (comma-separated values) that can be read by most spreadsheet applications such as Excel and Numbers (file extension .csv).
The File->Print command allows you to send the results to a printer. The print-out contains essentially the same information as when you save your result to file plus the scanned image itself.
You can add additional comments to the file and the print out. Edit->Comment launches a simple input dialog that allows to add a short comment, e.g. on the origin of the plot like publication, journal, author etc.
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To aid placing the markers and, in some cases, improve the scan quality the Density Histogram can be used. It depicts the grayscale density1 of the pixels along the horizontal and vertical cursor axis at the current position. Pixel 0 is the actual cursor position. The histogram covers ±5 pixels to the left (up) and right (down) of the current position. This is especially useful for fine adjustments with Alt (Option) + arrow
. Launch it via View->Density Histogram
or Ctrl+G (macOS: ⌘+G). By default the pixel along the horizontal (red) and vertical (blue) axis are shown. A pull-down menu in the upper left allows to hide either the horizontal or vertical axis density.
1 The grayscale density is obtained by converting a pixel into its grayscale equivalent and inverting the value so that high numbers indicate higher densities (blacker). White has a value of 0 and black is 255.
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