diff --git a/brew/water_optimizer.m b/brew/water_optimizer.m
index 6c982cf..d6852db 100644
--- a/brew/water_optimizer.m
+++ b/brew/water_optimizer.m
@@ -53,11 +53,12 @@ A = 0*T
 Pa = [0 0 0 0]';
 Pp = [M_CaSO4; M_CaCl2; M_MgSO4; M_NaCl];
 
-CONV_COUNTER_RELOAD = 10;
+_dn = [];
+CONV_COUNTER_RELOAD = 20;
 Dn0 = 1;
 conv_counter = CONV_COUNTER_RELOAD;
 while true,
-  [A1, Pa, Dn1] = vecfit(Pp,mask,T,A,Pa, 0.0001.*(1-exp(-Dn0)))
+  [A1, Pa, Dn1] = vecfit(Pp,mask,T,A,Pa, 0.001.*(1-exp(-Dn0)))
   Dc = round_n(Dn1,3);
   if Dn0 == Dc,
     if conv_counter == 0,
@@ -69,10 +70,14 @@ while true,
     conv_counter = CONV_COUNTER_RELOAD;
   end
   Dn0 = Dc;
+  _dn = [_dn Dn1];
 end
+plot(1:length(_dn), _dn); grid();
+title("Distance"); xlabel("Iteration"); ylabel("Dn")
 T=T
 A1=A1
 Pa=Pa
+
 endfunction
 
 function zr = round_n(z, n)