Can't make a line non-transparent

Hi, I’m using the LineCollection object to make the line multicolored. But as you can see, for some reason it’s not fully opaque (both parts of the line are visible at a point of intersection). I set alpha to 1.0, but it doesn’t help. The line consists of about 100,000 points.

Thanks in advance for any help or suggestions.

Here’s the code:

x = np.array(x)
y = np.array(y)

# Create a list of line segments
points = np.array([x, y]).T.reshape(-1, 1, 2)
segments = np.concatenate([points[:-1], points[1:]], axis=1)

# Create a LineCollection object with multicolored line segments
# (C is a list of colors that looks like [(0.1, 0.2, 0.3), (0.2, 0.3, 0.4)...]
lc = LineCollection(segments, colors=C, linewidths=25, alpha=1.0)

# Create a figure and axis object
fig, ax = plt.subplots(figsize=(12, 12))

# Set the background color of the plot
fig.set_facecolor('white')

# Add the LineCollection to the axis
ax.add_collection(lc)

# Set the axis limits
x_range = x.max() - x.min()
y_range = y.max() - y.min()
R = 0.05
ax.set_xlim(x.min() - x_range * R, x.max() + x_range * R)
ax.set_ylim(y.min() - y_range * R, y.max() + y_range * R)

ax.set_aspect('equal', 'datalim')
ax = plt.gca()

plt.axis('off')

# Show the plot
plt.show()

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