diff --git a/src/gui_qt/main/management.py b/src/gui_qt/main/management.py
index 5470c44..2f87e87 100644
--- a/src/gui_qt/main/management.py
+++ b/src/gui_qt/main/management.py
@@ -1176,21 +1176,23 @@ class UpperManagement(QtCore.QObject):
                 _x = x1 = self.data[params[0]].x
 
         x2 = opts['val2']
-
         sd = opts['spec_dens']
-        sd_param = [self.data[p].y.real if isinstance(p, str) else p for p in opts['sd_param'][0]]
-        sd.convert(_x, *sd_param, from_=opts['tau_type'], to_='raw')
+        sd_param = list(zip(*[self.data[p].y.real if isinstance(p, str) else [p]*len(_x) for p in opts['sd_param'][0]]))
 
         relax = Relaxation()
-        relax.set_distribution(sd, parameter=sd_param, keywords=opts['sd_param'][1])
+        relax.set_distribution(sd, keywords=opts['sd_param'][1])
 
-        cp_param = [self.data[p].y.real if isinstance(p, str) else p for p in opts['cp_param'][0]]
-        relax.set_coupling(opts['coup'], parameter=cp_param, keywords=opts['cp_param'][1])
+        cp_param = list(zip(*[self.data[p].y.real if isinstance(p, str) else [p]*len(_x) for p in opts['cp_param'][0]]))
+        # relax.set_coupling(opts['coup'], parameter=cp_param, keywords=opts['cp_param'][1])
 
-        if opts['out'] == 't1':
-            y = relax.t1(x2, _x)
-        else:
-            y = relax.t2(x2, _x)
+        relax_func = relax.t1 if opts['out'] == 't1' else relax.t2
+        y = np.zeros(_x.size)
+
+        for i in range(_x.size):
+            _x[i] = sd.convert(_x[i], *sd_param[i], from_=opts['tau_type'], to_='raw')
+            relax.dist_parameter = sd_param[i]
+            relax.set_coupling(opts['coup'], parameter=cp_param[i], keywords=opts['cp_param'][1])
+            y[i] = relax_func(x2, _x[i])
 
         pts = Points(x1, y, name=sd.name)
         pts.meta.update(opts)