t/s     pH1     pH2     pH3
   1045	4.225	4.270	4.271
   1285	4.215	 4.258	4.263
   1465	4.208	 4.248	4.257
   2185	4.184	 4.221	  4.241
   2845	4.160	 4.203	4.226
   3925	4.130	4.138	4.174
   5845	4.065	4.060	4.124
  11725	3.972	3.978	  4.053
  18925	3.863	3.910	4.002
  28345	3.791	3.870	3.967
  38785	3.730	3.816	3.918
  45625	3.684	3.761	3.899
  78685	3.598	3.662	3.805
 107305	3.496	3.528	3.683
 207565	3.351	3.419	3.581
 287485	3.247	3.370	3.544
 381145	3.190	3.326	3.497
 453505	3.154	3.316	3.485
 557125	3.143	3.272	3.442
 788665	3.106	3.228	3.396
 982765	3.051	3.224	3.383
1227385	3.057	3.170	3.327
1592905	3.003	3.156	3.319
2078065	3.009	3.142	3.287
3029065	2.993	3.122	3.261