update key to be used in lookup.

solventmapcreator/polynomialanalysis/polynomialsimilaritymatrixplotting.py

@@ -29,7 +29,7 @@ def plot_similarity_matrix(input_data, **kwargs):
     """This creates the similarity plot for the given input data.
     """
     simil_plot, simil_plot_axis = create_plot_with_axis(kwargs.get("figsize",
-                                                                   plottinginput.FIGURE_SIZES['similarity_matrix']))
+                                                                   plottinginput.FIGURE_SIZES['similarity matrix']))
     mat_ax = simil_plot_axis.matshow(input_data["value_matrix"], interpolation="nearest")
     simil_plot_axis.grid(True)
     simil_plot_axis.xticks(range(len(input_data["labels"])), input_data["labels"])