bin/us-plot: fix usage message

bin/us-plot

@@ -7,7 +7,20 @@ sys.path.insert(0, str(Path(__file__).absolute().parents[1]))
 from frappy.client.interactive import Client
 import numpy as np
 import matplotlib.pyplot as plt
-from frappy.iqplot import Pause
+from frappy_psi.iqplot import Pause
+
+
+if len(sys.argv) < 2:
+    print("""
+    Usage:
+
+        us-plot <end> [<start> [<npoints>]]
+
+        end: end of window [ns]
+        start: start of window [n2], default: 0
+        npoints: number fo points (default 1000)
+    """)
+    sys.exit(0)
 
 Client('pc13252:5000')
 
@@ -24,18 +37,6 @@ def update(array, line, xs):
 def on_close(event):
     sys.exit(0)
 
-# inp_signal.read()
-# out_signal.read()
-
-if len(sys.argv) < 2:
-    print("""
-    Usage: python3 sig.py <end> [<start> [<npoints>]]
-
-    end: end of window [ns]
-    start: start of window [n2], default: 0
-    npoints: number fo points (default 1000)
-    """)
-else:
 start = 0
 end = float(sys.argv[1])
 npoints = 1000