diff --git a/user/psava/Msmopick.py b/user/psava/Msmopick.py
index 35c5474fc..e344098e2 100755
--- a/user/psava/Msmopick.py
+++ b/user/psava/Msmopick.py
@@ -4,8 +4,40 @@
 '''
 import rsf.api as rsf
 import numpy as np
+from scipy.sparse        import spdiags
+from scipy.sparse.linalg import spsolve
 import sys
 
+# ------------------------------------------------------------
+def idnop1D(n):
+    e = np.ones( n, dtype='float')
+    Lopr = spdiags([e], [0], n,n)
+    return Lopr
+
+def idnop2D(nx,nz):
+    n = nx*nz
+    e = np.ones( n, dtype='float')
+
+    Lopr = spdiags([e], [0], n,n)
+    return Lopr
+# ------------------------------------------------------------
+def lapop1D(n):
+    e = np.ones( n, dtype='float')
+    Lopr = spdiags([e, -2*e, e], [-1, 0, +1], n,n)
+    return Lopr
+
+def lapop2D(nx,nz):
+    n = nx*nz
+    e = np.ones( n, dtype='float')
+
+    u = e.copy()
+    u[::nz]=0
+
+    l = e.copy()
+    l[nz-1::nz]=0
+
+    Lopr = spdiags([e, l, -4*e, u,e], [-nz, -1, 0, +1, +nz], n,n)
+    return Lopr
 # ------------------------------------------------------------
 def myMean(a,n):
     
@@ -33,13 +65,16 @@ def myMedian(a,n):
         b[i] = np.median( a[wLO:wHI] )
     
     return b
+# ------------------------------------------------------------
 
-
+# ------------------------------------------------------------
 par = rsf.Par()
 
 verb = par.bool('verb',False) # verbosity flag
-mean = par.bool('mean',False) # verbosity flag
-nmed = par.int('ns',1)        # number of filter samples
+mode = par.int ('mode',0)     # smoothing mode
+
+if mode == 0 or mode == 1:
+    nwin = par.int('nwin',1) # window size (mean & median)
 
 # ------------------------------------------------------------
 Fin = rsf.Input()             # input file
@@ -47,14 +82,19 @@ def myMedian(a,n):
 o1 = Fin.float("o1")
 d1 = Fin.float("d1")
 
-nd = Fin.size(1);             # number of traces
+n2 = Fin.int  ("n2")
+o2 = Fin.float("o2")
+d2 = Fin.float("d2")
+
+nd = n2                       # number of samples
 nm = nd
 
 # ------------------------------------------------------------
 Fou = rsf.Output()            # output file
-Fou.put("n1",nd)
-Fou.put("o1",0.0)
-Fou.put('d1',1.0)
+
+Fou.put("n1",n2)
+Fou.put("o1",o2)
+Fou.put('d1',d2)
 
 Fou.put("n2",3)
 Fou.put("n3",1)
@@ -68,17 +108,79 @@ def myMedian(a,n):
 wgh = np.zeros(nd,'f') # weights
 
 # ------------------------------------------------------------
+l1 = 0.5 * n1*d1              # xcorr time window
+
 for i in range(nd):
     Fin.read(din)
 
     pck[i] = o1 + np.argmax(din) * d1  # raw picks
     wgh[i] = np.max(din)               # data weight
 
-#spk = signal.medfilt(pck,2751)
-if mean:
-    spk = myMean(pck,nmed)
-else:
-    spk = myMedian(pck,nmed)
+wgh /= np.max(wgh)
+pckmed = np.median(pck)
+#print(pckmed,file=sys.stderr)
+
+wgh = np.where(np.abs(pck) < 0.9*l1, wgh, 0.0)
+pck = np.where(np.abs(pck) < 0.9*l1, pck, pckmed)
+
+if   mode == 0: # use mean
+    print("USE MEAN",mode,file=sys.stderr)
+    spk =   myMean(pck,nwin)
+
+elif mode == 1: # use median
+    print("USE MEDIAN",mode,file=sys.stderr)
+    spk = myMedian(pck,nwin)
+
+else:           # solve inverse problem
+    print("USE INVERSION",mode,file=sys.stderr)
+
+    #print(np.mean(pck),file=sys.stderr)
+    #print(np.mean(wgh),file=sys.stderr)
+
+    # ------------------------------------------------------------
+    mbar = pck*0 + pckmed                 # reference model
+    dbar = pck                            # rough picks
+
+    WDop = spdiags(wgh,[0],nd,nd)         # data weight operator
+    Gop  = idnop1D(nd)                    # mapping operator
+    Rop  = lapop1D(nm)                    # regularization operator
+
+    # ------------------------------------------------------------
+    # L-curve
+    # ------------------------------------------------------------
+    ne = par.int  ('ne',1)
+    oe = par.float('oe',0.0)
+    de = par.float('de',+0.1)
+    ee = np.arange(oe, oe+ne*de, de)
+    se = np.power(10,ee)
+
+    ME = np.zeros( (nm,ne), dtype='float')
+    rd = np.zeros(     ne,  dtype='float')
+    rm = np.zeros(     ne,  dtype='float')
+
+    for ie in range(ne):
+
+        # scale the regularization operator
+        WMop =  Rop / se[ie] 
+
+        # solve the IP
+        modE = spsolve( (WDop*Gop).T * (WDop*Gop)  + WMop.T * WMop , \
+                        (WDop*Gop).T * WDop * dbar + WMop.T * WMop * mbar)
+    
+        # store the model
+        ME[:,ie] = modE 
+
+        # compute residual norms
+        rd[ie] = np.linalg.norm( WDop * (Gop * modE - dbar))
+        rm[ie] = np.linalg.norm(  Rop * (      modE - mbar))
+
+    rdn = rd / np.max(rd) # normalized the  data residual norm
+    rmn = rm / np.max(rm) # normalized the model residual norm
+    rrn = rdn**2 + rmn**2 # compute the distance from origin
+
+    je = np.argmin(rrn)   # index of the optimal model
+    spk = ME[:,je]        #              optimal model
+
 
 # ------------------------------------------------------------
 # write picks and weights