diff --git a/SimPEG/Parallel.py b/SimPEG/Parallel.py
index a09547b6..7e15e177 100644
--- a/SimPEG/Parallel.py
+++ b/SimPEG/Parallel.py
@@ -528,6 +528,44 @@ class RemoteInterface(object):
     def remoteDifferenceGatherFirst(self, *args):
         self.remoteOpGatherFirst('-', *args)
 
+    def remoteSrcEstGatherFirst(self, keyresult, key1, key2, individual=False):
+
+        if self.useMPI:
+
+            root = 0
+
+            # # Gather
+            # code_reduce = 'temp_%(key)s = comm.reduce(%(key)s, root=%(root)d)'
+            # self.dview.execute(code_reduce%{'key': key1, 'root': root})
+
+            # SrcEst
+            if individual:
+                code_srcest = '%(keyresult)s = (%(key2)s.conj() * %(key1)s).sum(axis=1) / (%(key1)s.conj() * %(key1)s).sum(axis=1)'
+            else:
+                code_srcest = '%(keyresult)s = (%(key2)s.conj() * %(key1)s).sum() / (%(key1)s.conj() * %(key1)s).sum()'
+            self.e0.execute(code_srcest%{'key1': key1, 'key2': key2, 'keyresult': keyresult})
+
+            # Broadcast
+            code = 'if rank != %(root)d: %(key)s = None\n%(key)s = comm.bcast(%(key)s, root=%(root)d)'
+            self.dview.execute(code%{'key': keyresult, 'root': root})
+
+        else:
+
+            item1 = reduce(np.add, self.dview[key1])
+            item2 = self.e0[key2]
+
+            if individual:
+                item = (item2.conj() * item1).sum(axis=1) / (item1.conj() * item1).sum(axis=1)
+            else:
+                item = (item2.conj() * item1).sum() / (item1.conj() * item1).sum()
+
+            self.dview[keyresult] = item
+
+    def remoteApplySrc(self, keyData, keySrc):
+
+        code = '%(keyData)s = %(keySrc)s * %(keyData)s'
+        self.dview.execute(code%{'keyData': keyData, 'keySrc': keySrc})
+
     # def normFromDifference(self, key):
 
     #     code = 'temp_norm%(key)s = (%(key)s * %(key)s.conj()).sum(0).sum(0)'