diff --git a/code/plot_introduction_specs.py b/code/plot_introduction_specs.py
new file mode 100644
index 0000000..425fed0
--- /dev/null
+++ b/code/plot_introduction_specs.py
@@ -0,0 +1,118 @@
+import numpy as np
+import matplotlib.pyplot as plt
+from thunderfish.powerspectrum import spectrogram, decibel
+
+from modules.filehandling import LoadData
+from modules.datahandling import instantaneous_frequency
+from modules.filters import bandpass_filter
+from modules.plotstyle import PlotStyle
+
+ps = PlotStyle()
+
+
+def main():
+
+    # Load data
+    datapath = "../data/2022-06-02-10_00/"
+    data = LoadData(datapath)
+
+    # good chirp times for data: 2022-06-02-10_00
+    window_start_seconds = 3 * 60 * 60 + 6 * 60 + 43.5 + 9 + 6.22
+    window_start_index = window_start_seconds * data.raw_rate
+    window_duration_seconds = 0.3
+    window_duration_index = window_duration_seconds * data.raw_rate
+
+    timescaler = 1000
+
+    raw = data.raw[window_start_index:window_start_index +
+                   window_duration_index, 10]
+
+    fig, (ax1, ax2, ax3) = plt.subplots(
+        3, 1, figsize=(16 * ps.cm, 12*ps.cm), sharex=True, sharey=True)
+
+    # plot instantaneous frequency
+    filtered1 = bandpass_filter(
+        signal=raw, lowf=750, highf=1200, samplerate=data.raw_rate)
+    filtered2 = bandpass_filter(
+        signal=raw, lowf=550, highf=700, samplerate=data.raw_rate)
+
+    freqtime1, freq1 = instantaneous_frequency(
+        filtered1, data.raw_rate, smoothing_window=3)
+    freqtime2, freq2 = instantaneous_frequency(
+        filtered2, data.raw_rate, smoothing_window=3)
+
+    ax1.plot(freqtime1*timescaler, freq1, color=ps.gblue1,
+             lw=2, label=f"fish 1, {np.median(freq1):.0f} Hz")
+    ax1.plot(freqtime2*timescaler, freq2, color=ps.gblue3,
+             lw=2, label=f"fish 2, {np.median(freq2):.0f} Hz")
+    ax1.legend(bbox_to_anchor=(0, 1.02, 1, 0.2), loc="lower center",
+               mode="normal", borderaxespad=0, ncol=2)
+    ps.hide_xax(ax1)
+
+    # plot fine spectrogram
+    spec_power, spec_freqs, spec_times = spectrogram(
+        raw,
+        ratetime=data.raw_rate,
+        freq_resolution=150,
+        overlap_frac=0.2,
+    )
+
+    ylims = [300, 1200]
+    fmask = np.zeros(spec_freqs.shape, dtype=bool)
+    fmask[(spec_freqs > ylims[0]) & (spec_freqs < ylims[1])] = True
+
+    ax2.imshow(
+        decibel(spec_power[fmask, :]),
+        extent=[
+            spec_times[0]*timescaler,
+            spec_times[-1]*timescaler,
+            spec_freqs[fmask][0],
+            spec_freqs[fmask][-1],
+        ],
+        aspect="auto",
+        origin="lower",
+        interpolation="gaussian",
+        alpha=1,
+    )
+    ps.hide_xax(ax2)
+
+    # plot coarse spectrogram
+    spec_power, spec_freqs, spec_times = spectrogram(
+        raw,
+        ratetime=data.raw_rate,
+        freq_resolution=10,
+        overlap_frac=0.3,
+    )
+    fmask = np.zeros(spec_freqs.shape, dtype=bool)
+    fmask[(spec_freqs > ylims[0]) & (spec_freqs < ylims[1])] = True
+    ax3.imshow(
+        decibel(spec_power[fmask, :]),
+        extent=[
+            spec_times[0]*timescaler,
+            spec_times[-1]*timescaler,
+            spec_freqs[fmask][0],
+            spec_freqs[fmask][-1],
+        ],
+        aspect="auto",
+        origin="lower",
+        interpolation="gaussian",
+        alpha=1,
+    )
+    # ps.hide_xax(ax3)
+
+    ax3.set_xlabel("time [ms]")
+    ax2.set_ylabel("frequency [Hz]")
+
+    ax1.set_yticks(np.arange(300, 1201, 300))
+    ax1.spines.left.set_bounds((300, 1200))
+    ax2.set_yticks(np.arange(300, 1201, 300))
+    ax2.spines.left.set_bounds((300, 1200))
+    ax3.set_yticks(np.arange(300, 1201, 300))
+    ax3.spines.left.set_bounds((300, 1200))
+
+    plt.savefig('../poster/figs/introplot.pdf')
+    plt.show()
+
+
+if __name__ == '__main__':
+    main()
diff --git a/poster/figs/introplot.pdf b/poster/figs/introplot.pdf
new file mode 100644
index 0000000..0b9e74e
Binary files /dev/null and b/poster/figs/introplot.pdf differ
diff --git a/poster/main.tex b/poster/main.tex
index d979b7e..1b8e8a9 100644
--- a/poster/main.tex
+++ b/poster/main.tex
@@ -1,4 +1,4 @@
-\documentclass[25pt, a0paper, landscape, margin=0mm, innermargin=20mm,
+/documentclass[25pt, a0paper, landscape, margin=0mm, innermargin=20mm,
 blockverticalspace=2mm, colspace=20mm, subcolspace=0mm]{tikzposter} %Default values for poster format options.
 
 \input{packages}