Task: Formula-prediction-context (source dataset: ti-random)

You are given an table region extracted from a real Excel spreadsheet, which is centered around a cell called "Target Cell" (labeled as "[Target Cell]" shown in the table below). The table region below includes up to 10 rows above/below the Target Cell, and 10 columns to the left/right of the Target Cell. 

Your task is to analyze the table context surrounding the Target Cell, and predict the most likely Excel formula that should go in the Target Cell. If multiple formulas are possible, choose the most reasonable or commonly used based on context.

1. Please follow the standard formula syntax in Excel, e.g. always begins with an equal sign (=).
2. Base your predicted formula on the surrounding table context, e.g., column headers, annotations, and data values in nearby cells.
3. No explanation — just output the formula itself in a JSON format: {"formula": "your_formula_here"}.

Input Excel Snippet in Markdown format:
|    | A                                   | B                  | C                 | D   | E                                                                                                                                |
|---:|:------------------------------------|:-------------------|:------------------|:----|:---------------------------------------------------------------------------------------------------------------------------------|
|  7 | DDR_CK trace                        | 2.2565944881889766 | 1.612224409448819 |     | input the average of DDR_CK and DDR_CKn traces.  If you have two x8 memories, use the trace lengths for each corresponding byte. |
|  8 | DDR_DQSx trace                      | 2.074773228346457  | 1.814232283464567 |     | x can be 0 or 1, corresponding to each byte.                                                                                     |
|  9 |                                     |                    |                   |     |                                                                                                                                  |
| 10 | Intermediate values (per byte lane) |                    |                   |     |                                                                                                                                  |
| 11 | WR DQS                              | 83                 | 7C                |     | these are just used for the calculations below                                                                                   |
| 12 | RD DQS                              | 40                 | 40                |     | these are just used for the calculations below                                                                                   |
| 13 | RD DQS GATE                         | 136                | 120               |     | these are just used for the calculations below                                                                                   |
| 14 |                                     |                    |                   |     |                                                                                                                                  |
| 15 | Seed values used in CCS code        |                    |                   |     |                                                                                                                                  |
| 16 | DATAx_PHY_RD DQS_SLAVE_RATIO        | 40                 |                   |     |                                                                                                                                  |
| 17 | DATAx_PHY_FIFO_WE_SLAVE_RATIO       | [Target Cell]      |                   |     |                                                                                                                                  |
| 18 | DATAx_PHY_WR DQS_SLAVE_RATIO        | 7F                 |                   |     |                                                                                                                                  |
| 19 |                                     |                    |                   |     |                                                                                                                                  |
| 20 | Register value                      |                    |                   |     |                                                                                                                                  |
| 21 | CMDx_PHY_CTRL_SLAVE_RATIO           | 100                |                   |     |                                                                                                                                  |



min_row: 7
max_row: 21
min_col: 1
max_col: 5
target_cell_row_idx: 17
target_cell_col_idx: 2
target_cell_value: 12B
formula: =DEC2HEX(      (HEX2DEC(B13)+HEX2DEC(C13))/2)