Remove constant difficulty curves and limit the height considered

1. As our approach is in theory not justified (at least proven that it
   makes sense)
2. #5 (comment 12036)

plot_statistics_one.py

@@ -7,14 +7,14 @@ SHOW_TARGET_RECOMPUTATION = False
 with open('data.json') as f:
     data = json.load(f)
 
-with open('data_constant_difficulty.json') as f:
-    dataConstantDifficulty = json.load(f)
-
 fig, targetsAxis = plt.subplots()
 fig.subplots_adjust(right = 0.8)
 fig.subplots_adjust(bottom = 0.4)
 compressedScoreAxis = targetsAxis.twinx()
-axes = [targetsAxis, targetsAxis.twinx(), compressedScoreAxis, targetsAxis.twinx(), compressedScoreAxis]
+axes = [targetsAxis, targetsAxis.twinx(), compressedScoreAxis]
+
+for key in data:
+    data[key] = data[key][:428_078]
 
 targets = data['targets']
 
@@ -32,23 +32,19 @@ for x, (target, nextTarget) in enumerate(zip(targets, targets[1:])):
     if nextTarget > target:
         targetIncreaseCurve = plt.axvline(x = x, alpha = 0.5, color = 'red', label = 'target increase')
 
-axesColors = ['blue', 'green', 'brown', 'orange', 'brown']
-axesLabels = ['targets', 'compressed blockchain size (in blocks)', 'compressed blockchain score', 'constant difficulty compressed blockchain size (in blocks)', 'constant difficulty compressed blockchain score']
-axesYValues = [targets, data['compressSize'], data['compressScore'], dataConstantDifficulty['compressSize'], dataConstantDifficulty['compressScore']]
+axesColors = ['blue', 'green', 'brown']
+axesLabels = ['targets', 'compressed blockchain size (in blocks)', 'compressed blockchain score']
+axesYValues = [targets, data['compressSize'], data['compressScore']]
 
 curves = []
 for curvesIndex, (axis, color, label, yValues) in enumerate(zip(axes, axesColors, axesLabels, axesYValues)):
-    dashes = (None, None) if curvesIndex != 4 else [1, 25]
-    alpha = 1 if curvesIndex != 3 else 0.5
-    curves += axis.plot(yValues, label = label, color = color, dashes = dashes, alpha = alpha)
+    curves += axis.plot(yValues, label = label, color = color)
 
 targetsAxis.set_yscale('log', base=2)
 
 axes[2].spines.right.set_position(('axes', 1.1))
 axes[2].set_yscale('log')
 
-axes[-2].spines.right.set_position(('axes', 1.2))
-
 legendNewLine = targetsAxis.plot([], [], color='none', label=' ')
 curves.insert(-2, legendNewLine[0])
 
@@ -65,6 +61,6 @@ for ax, color in zip(axes, axesColors):
 title = 'Variable difficulty Bitcoin compressed blockchain evolution'
 plt.title(title)
 
-#plt.show()
+plt.show()
 fig.set_size_inches((11.2, 7.5), forward=False)
-plt.savefig(f'{title.lower().replace(" ", "_")}.svg')
+#plt.savefig(f'{title.lower().replace(" ", "_")}.svg')