Update README.md

Author: hildobby

README.md

@@ -1,6 +1,5 @@
 Expanding and exploring the Bak-Sneppen model written in Python 3+
 =========================================
-
 2 dimensions and 3 dimensions Bak-Snappen model, evaluation of the resulting model behaviour and effect of various parameters.
 
 By: [Hildebert Moulié](https://github.com/hildobby), [Philippe Nicolau](https://github.com/PNicolau96), [Louis Weyland](https://github.com/LouisWW) & [Binjie Zhou](https://github.com/binjiezhou).
@@ -11,7 +10,6 @@ By: [Hildebert Moulié](https://github.com/hildobby), [Philippe Nicolau](https:/
 </p>
 
 ## Project Plan
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 1. Bring the 1 dimension Bak-Snappen model to 2 dimensions and 3 dimensions
 2. Evaluate different results from the model:
     * Avalanche time and compare it between several models
@@ -26,8 +24,10 @@ By: [Hildebert Moulié](https://github.com/hildobby), [Philippe Nicolau](https:/
 ![Fitness over time](https://github.com/hildobby/Complex_System/blob/master/src/figures/average_fitness_s%3D(20%2C%2020)_itr%3D2000_rep%3D10_std%3D0.3.png)
 
 ### Impact of percentage of empty node
-![Avalanche for different percentages of empty node](https://github.com/hildobby/Complex_System/blob/master/src/figures/avalanche_empy_space_percentage_comparison.png)
-![Threshold for different percentages of empty node](https://github.com/hildobby/Complex_System/blob/master/src/figures/threshold_empy_space_percentage_comparison.png)
+<p float="left" class="center">
+  <img src="https://github.com/hildobby/Complex_System/blob/master/src/figures/avalanche_empy_space_percentage_comparison.png" width="400" />
+  <img src="https://github.com/hildobby/Complex_System/blob/master/src/figures/threshold_empy_space_percentage_comparison.png" width="400" /> 
+</p>
 
 
 ### Cluster size distribution for different grid sizes
@@ -51,7 +51,6 @@ jupyter nbconvert results_presentation.ipynb --to slides --post serve
 ```
 
 ## References
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 * Alstott, J., Bullmore, E., & Plenz, D. (2014). powerlaw: a Python package for analysis of heavy-tailed distributions. PloS one, 9(1), e85777.
 * Bak, P., & Sneppen, K. (1993). Punctuated equilibrium and criticality in a simple model of evolution. Physical review letters, 71(24), 4083.
 * Fraiman, D. (2018). Bak-Sneppen model: Local equilibrium and critical value. Physical Review E, 97(4), 042123.