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diff --git a/scripts/find-pairs b/scripts/find-pairs
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+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+#
+# Find pairs of observations from the same pattern
+#
+# Copyright © 2014 Deutsches Elektronen-Synchrotron DESY,
+#                  a research centre of the Helmholtz Association.
+#
+# Author:
+#    2014 Thomas White <taw@physics.org>
+#
+
+import re as regexp
+
+fn1 = "test-0.5.0-satfix.stream"
+fn2 = "test-curr.stream"
+
+def find_405(f):
+    lines = dict()
+    fn = ""
+    prog = regexp.compile("^\s+([\d-]+)\s+([\d-]+)\s+([\d-]+)\s+")
+    while True:
+        fline = f.readline()
+        if not fline:
+            break
+        if fline.find("Image filename: ") != -1:
+            fn = fline.split(': ')[1].rstrip("\r\n")
+            continue
+        match = prog.match(fline)
+        if not match:
+            continue
+        h = int(match.group(1))
+        k = int(match.group(2))
+        l = int(match.group(3))
+        if (h==0) and (k==0) and (l==6):
+            lines[fn] = fline
+        if (h==0) and (k==0) and (l==-6):
+            lines[fn] = fline
+    return lines
+
+f = open(fn1, 'r')
+flines = find_405(f)
+print len(flines),"measurements in",fn1
+
+g = open(fn2, 'r')
+glines = find_405(g)
+print len(glines),"measurements in",fn2
+
+print "\nThe common measurements:\n"
+for fn in flines.keys():
+    if fn in glines:
+        print fn
+        print flines[fn].rstrip("\r\n")
+        print glines[fn]
+        print
+        del flines[fn]
+        del glines[fn]
+
+print "\nThe measurements only in",fn1,":\n"
+
+for fn in flines.keys():
+    print fn
+    print flines[fn].rstrip("\r\n")
+    print
+
+print "\nThe measurements only in",fn2,":\n"
+
+for fn in glines.keys():
+    print fn
+    print glines[fn].rstrip("\r\n")
+    print
+