| T S (degC) | Wheel velocity (m/s) | DH (-j/g) (+-3%) |
| 150        | 20                   | 68.73            |
| 150        | 30                   | 72.30            |
| 150        | 40                   | -                |
| 250        | 20                   | 72.10            |
| 250        | 30                   | 78.9             |
| 250        | 40                   | 79.23            |

Caption: Summary of the measured exothermic crystallization energy (in J/g) and sample preparation conditions applied

You are provided with a table from a material science paper. Here are JSON templates for two types of numeric cells: "Other" and "Glass_Compound_Amount":
{"value": "xx", "type": "Other"}
{"value": "xx", "type": "Glass_Compound_Amount", "constituent": "xx", "unit": "xx", "material": "xx"}

Please describe all numeric cells in the above table following the JSON templates (proceeding by row in a left-right, top-down direction). For each cell, output one JSON description per line. For any unanswerable attributes in the templates, set their value to the placeholder "xx".

Cell Description:
{"value": "150", "type": "Other"}
{"value": "20", "type": "Other"}
{"value": "68.73", "type": "Other"}
{"value": "150", "type": "Other"}
{"value": "30", "type": "Other"}
{"value": "72.30", "type": "Other"}
{"value": "150", "type": "Other"}
{"value": "40", "type": "Other"}
{"value": "250", "type": "Other"}
{"value": "20", "type": "Other"}
{"value": "72.10", "type": "Other"}
{"value": "250", "type": "Other"}
{"value": "30", "type": "Other"}
{"value": "78.9", "type": "Other"}
{"value": "250", "type": "Other"}
{"value": "40", "type": "Other"}
{"value": "79.23", "type": "Other"}