phase_3x_separate.jpg
The user wants a detailed description of an image containing three stacked line graphs.
I need to describe:
1.  **Overall Layout:** Three horizontal plots stacked vertically.
2.  **Axes:**
    *   Y-axis label: "Amplitude (Arbitrary)" ranging from -2 to 2.
    *   X-axis label: "Time (Arbitrary)" with ticks at 0.0, 2.5, 5.0, 7.5.
3.  **Individual Plots:**
    *   Top plot: Red line labeled "base". It's a sine wave. One full cycle roughly from x=0 to x=6. Wait, let's look closer. It starts at -0.5, goes up to 1, down to -1, back to -0.5. Actually, looking at the grid lines:
        *   Starts around y=-0.5.
        *   Peak at y=1 around x=2.
        *   Trough at y=-1 around x=4.5.
        *   Ends around y=-0.5.
    *   Middle plot: Green line labeled "freq_3x". It's a higher frequency sine wave. Starts at -1, goes up to 1, down to -1. There are about 4 full cycles visible.
    *   Bottom plot: Blue line labeled "sum". This is the sum of the previous two waves. It has a complex shape with varying amplitudes.
4.  **Legend:** Located on the right side. Title "Wave". Entries: Red square "base", Green square "freq_3x", Blue square "sum".
5.  **Grid/Background:** Light gray background with white grid lines.

Let's refine the description of the waves based on visual inspection.
*   **Top (Red - base):** Starts at y=-0.5. Rises to a peak of y=1 around x=2. Crosses zero around x=3. Reaches a trough of y=-1 around x=4.5. Crosses zero again around x=6. Rises back towards the end. It looks like roughly 1.5 cycles or so? No, let's count peaks. One peak at x=2. Another peak starts appearing near x=7. So it's a low frequency wave.
*   **Middle (Green - freq_3x):** Starts at y=-1. Peaks at y=1 around x=0.5. Troughs at y=-1 around x=1.5. This is clearly 3 times the frequency of the red wave if we assume the red wave has a period of roughly 6 units (from peak to peak). Let's check: Red peak at ~2. Next peak would be at ~8. Green peaks are at ~0.5, ~2, ~3.5, ~5, ~6.5. Wait, let's look at the grid.
    *   Grid lines on X-axis: 0.0, 2.5, 5.0, 7.5. The major grid lines are every 2.5 units. There are smaller subdivisions. Let's assume the distance between 0 and 2.5 is divided into 5 blocks? No, looks like 10 blocks. So each small block is 0.25 units.
    *   Red wave: Peak at x=2 (8 blocks). Trough at x=4.5 (18 blocks). Period seems to be around 6 units (from trough to trough would be 4.5 + 6 = 10.5? No, that doesn't fit the end). Let's look at zero crossings. Starts -0.5. Crosses up at x=1. Peak at x=2. Crosses down at x=3. Trough at x=4. Crosses up at x=5. Wait, looking closer at the red wave.
    *   Red wave: Starts y=-0.5. Crosses zero at x=1. Peak y=1 at x=2. Crosses zero at x=3. Trough y=-1 at x=4. Crosses zero at x=5. Wait, looking at the image again.
    *   Let's re-evaluate the red wave. It starts at x=0, y is roughly -0.5. It goes up. Peak is at x=2 (approx). Then down. Trough is at x=4.5 (approx). Then up. At x=7.5 it is near a peak? No, at x=7.5 it's going down from a peak.
    *   Actually, let's look at the labels on the right side of the plots themselves. "base", "freq_3x", "sum". These confirm the legend.

Let's describe the visual features clearly
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