The trick for highlighting a specific group is to plot all the groups with thin and discreet lines first. Then, replot the interesting group(s) with strong and really visible line(s). Moreover, it is good practice to annotate this highlighted group with a custom annotation. The following example shows how to do that by using the color, linewidth and alpha parameters of the plot() function of matplotlib.

# libraries
import matplotlib.pyplot as plt
import numpy as np
import pandas as pd
# Make a data frame
df=pd.DataFrame({'x': range(1,11), 'y1': np.random.randn(10), 'y2': np.random.randn(10)+range(1,11), 'y3': np.random.randn(10)+range(11,21), 'y4': np.random.randn(10)+range(6,16), 'y5': np.random.randn(10)+range(4,14)+(0,0,0,0,0,0,0,-3,-8,-6), 'y6': np.random.randn(10)+range(2,12), 'y7': np.random.randn(10)+range(5,15), 'y8': np.random.randn(10)+range(4,14) })

# Change the style of plot'seaborn-darkgrid')

# set figure size
plt.figure(figsize=(480/my_dpi, 480/my_dpi), dpi=my_dpi)
# plot multiple lines
for column in df.drop('x', axis=1):
    plt.plot(df['x'], df[column], marker='', color='grey', linewidth=1, alpha=0.4)

# Now re do the interesting curve, but biger with distinct color
plt.plot(df['x'], df['y5'], marker='', color='orange', linewidth=4, alpha=0.7)
# Change x axis limit
# Let's annotate the plot
for i in df.values[9][1:]:
    if name != 'y5':
        plt.text(10.2, i, name, horizontalalignment='left', size='small', color='grey')

# And add a special annotation for the group we are interested in
plt.text(10.2, df.y5.tail(1), 'Mr Orange', horizontalalignment='left', size='small', color='orange')
# Add titles
plt.title("Evolution of Mr Orange vs other students", loc='left', fontsize=12, fontweight=0, color='orange')

# Show the graph


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