Update example.rst

docs/basics/example.rst

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 Examples
-========
+========
+
+Here we show the performance of the pgm package on two important materials of importance to geophysics and planetary modeling: cubic CaSiO3 perovskite (cCaPv), a highly anharmonic insulator without an approachable ground state, and B8 FeO, a metallic system with an approachable ground state.
+
+Example 1: cubic CaSiO3 perovskite (cCaPv)
+-------------------------------------------
+
+To run the example, execute the following commands in your terminal:
+
+.. code-block:: bash
+
+   cd examples/casio3
+   pgm run casio3.yaml
+
+The results will be generated in `./results/`.
+
+Example 2: NiAs-type ferrous oxide (B8 FeO)
+-------------------------------------------
+
+To run the example, execute the following commands in your terminal:
+
+.. code-block:: bash
+
+   cd examples/feo
+   pgm run feo.yaml
+
+The results will be generated in `./results/`.
+
+Note
+----
+
+For detailed calculation, method information and results, please refer to `our paper <https://authors.elsevier.com/c/1hQ5e_FEhOCgU>`_.