diff --git a/README.md b/README.md
index d83f308..639e9e3 100644
--- a/README.md
+++ b/README.md
@@ -7,5 +7,5 @@ Python based radio frequency satellite tracking
 To view data attached as example:
 
 ```
-python3 rfplot.py -p data -P 2021-08-04T20:48:35 -s 50 -l 1800 -C 4171
+python3 rfplot.py -p .\data\2021-08-04T20_48_35 -s 50 -l 1800 -C 4171
 ```
diff --git a/rfplot.py b/rfplot.py
index 32fbe68..7856105 100755
--- a/rfplot.py
+++ b/rfplot.py
@@ -136,6 +136,9 @@ def main():
     for sat_info in satellite_info:
         satellite = EarthSatellite(sat_info["tle"][-2], sat_info["tle"][-1])
         t, events = satellite.find_events(site_location, t0, t1, altitude_degrees=0.0)
+        alt, _, _ = (satellite - site_location).at(t0).altaz()
+        if len(t) == 0 and alt.degrees > 0:
+            t, events = [t0, t1], [0,2]
         if len(t) > 0:
             pairs = [ (ti, event)  for ti, event in zip(t, events)]
             if pairs[0][1] in [1,2]:
diff --git a/strf/rfio.py b/strf/rfio.py
index 9fc3e55..c105709 100644
--- a/strf/rfio.py
+++ b/strf/rfio.py
@@ -45,7 +45,7 @@ class Spectrogram:
             else:
                 print(f"Spectrogram is not available under {fname}\nUsing {fnames[0]} instead")
                 fname = fnames[0]
-                ifile = int(fname.split("_")[1].replace(".bin", ""))
+                ifile = int(fname.split("_")[-1].replace(".bin", ""))
 
         # Read first header
         with open(fname, "rb") as fp: