What is the difference between an analytical and a preparative and a semi-perperative? So the difference is remained in the column. Here we have a very, very thin column. And this column is very, very huge. The diameter is very big. And when we work with a semi-perperative, we have this kind of column, for example, 9.4, the diameter. The diameter here is 9.4. For the analytical one, we have 4.6, the diameter. And here we have 21.2. So you can notice very, very well the difference between each one. An analytical column here are very, very thin. And the particle size also are very, very thin. But concerning the semi-perperative, so the time is medium, the property is very, very thin.