Creating Graphs and Autographs


Interpretation of geochemical data using p:IGI+ really starts with graphs. Graphs in p:IGI+ can either be created by the user from scratch or using pre-defined plots (Autographs). Here we will look at the available Autographs and how to create new graphs.

Version: p:IGI+ 1.15.x  (Dec 2018)

Usage:  Graph --> New Graph --> New plot type... 

How to use in practice



To create a new graph in p:IGI+ select Graph --> New Graph --> New Respective Plot type... or use the toolbar shortcut icon, shown above. The resulting creation dialogue will show a Custom xxxx Plot option at the top of the graph list on the left hand side from which new graphs can be made. A range of different interpretative graph types are present within p:IGI+ and can be created (more are planned). For further details on each graph type select the link:

  • Scatter Plot - a 2-dimensional plot of x versus y, useful for directly comparing two properties. 
  • Histogram - a 1-dimensional plot showing the distribution of a single property. 
  • Triplot - a 2-dimensional plot showing three variables at once where it is assume the variables form a mixture that sums to 1 (or 100%).
  • Depth Plot - a 2-dimensional plot showing the depth variation of a property, where depth can be defined flexibly relative to a given datum.
  • Parallel Coordinate Plot - an n-dimensional plot where each variable is shown on an independent axis, good for data exploration over a range of properties.
  • Line Plot - an n-dimensional plot where all variables are shown on a shared axis and thus must be in the same unit group.
  • Chung Plot - a specialist 4- or 5-dimensional plot used to show carbon isotope ratios and their change over carbon number.

The Artefact Manager has a Default Base Blue folder for each graph type and once created a new graph will appear in the appropriate folder. From here created graphs can be relocated as wished and filtered as needed.

On creation, the graph axes on a new graph are auto-set to zoom to all project data. The axes extents, and many other properties in graphs can be edited through Graph Manager.  


Pre-defined autographs are listed within the respective new graph type creation dialogue window, accessed from (Graph --> New Graph --> New Respective Graph type... or use the toolbar shortcut icon). The New Graph Creation dialogue presents a list of all available autographs for that graph type alongside a preview window to view the autograph prior to creation.

The Autograph list can be filtered using a selection of keyword tags:

  • Age
  • Alteration
  • Correlation
  • Environment
  • Gas
  • Generation
  • Kerogen Potential
  • Kerogen Quality
  • Maturity
  • Migration
  • Unconventional

A reference list for the Autographs is provided in the p:IGI+ online User Guide.   

The Artefact Manager has a default base (blue) folder for each graph type and once created the chosen (auto)graph will appear in the appropriate folder, and open in a child window.

Video tutorials

None Available

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