Task: Formula-prediction-context (source dataset: enron-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     | F     | G                                       | H                 | I     | J             | K   | L   | M       | N      | O      | P    | Q                                  | R    | S   | T   |
|---:|:----|:------|:-----------------------------|:------------------------------------|:------|:------|:----------------------------------------|:------------------|:------|:--------------|:----|:----|:--------|:-------|:-------|:-----|:-----------------------------------|:-----|:----|:----|
| 13 |     |       |                              | Non-Spin Required:                  | 41.0  |       |                                         | TNP Contract:     | 25.0  |               |     |     |         |        |        |      |                                    |      |     |     |
| 14 |     |       |                              | Spin Required + Regulating Margin:  | 75.0  |       |                                         | SPS Contract:     | 100.0 |               |     |     |         |        |        |      |                                    |      |     |     |
| 15 |     |       |                              |                                     |       |       |                                         |                   |       | Lambda  =     | 0.0 |     |         |        |        |      |                                    |      |     |     |
| 16 |     |       |                              | *Amount of Spin:                    | 82.0  | 245.0 | Weighted Avg. Purchase Power Calculator |                   |       |               |     |     |         | Output | Highs' | Spin | RR                                 | LG   |     |     |
| 17 |     |       |                              | Amount of Non-Spin:                 | 75.0  | 275.0 |                                         |                   | MWH   | $/MWH         |     |     | Unit  1 | 68.0   | 77.0   | 9.0  | 3.0                                | 0.0  |     |     |
| 18 |     |       |                              | Total Spin:                         | 157.0 |       |                                         | Firm Block 1:     | 0.0   | 0.0           | 0.0 |     | 2.0     | 73.0   | 77.0   | 4.0  | 4.5                                | 0.0  |     |     |
| 19 |     |       |                              | Spin Available/(Deficient):         | 41.0  |       |                                         | Firm Block 2:     | 0.0   | 0.0           | 0.0 |     | 3.0     | 95.0   | 100.0  | 5.0  | 3.37                               | 0.0  |     |     |
| 20 |     |       |                              | Enter Firm Price:                   | 0.0   |       |                                         | Firm Block 3:     | 0.0   | 0.0           | 0.0 |     | GT1     | 0.0    | 0.0    | 0.0  | 10.0                               | 0.0  |     |     |
| 21 |     |       |                              | Enter Non-Firm Price:               | 0.0   |       |                                         | Firm Block 4:     | 0.0   | 0.0           | 0.0 |     | GT2     | 0.0    | 0.0    | 0.0  | 10.0                               | 0.0  |     |     |
| 22 |     |       |                              |                                     |       |       |                                         | Firm Block 5:     | 0.0   | 0.0           | 0.0 |     | GT1S    | 0.0    | 0.0    | 0.0  | 3.33                               | 0.0  |     |     |
| 23 |     |       |                              | MWH of Firm Avail./(Deficient):     | 41.0  |       |                                         | Total:            | 0.0   | [Target Cell] | 0.0 |     | GT2S    | 0.0    | 0.0    | 0.0  | 3.6                                | 0.0  |     |     |
| 24 |     |       |                              | Total Cost of Firm:                 | 0.0   |       |                                         |                   | MWH   | $/MWH         |     |     | NM4     | 200.0  | 210.0  | 10.0 | 3.6                                | 0.0  |     |     |
| 25 |     |       |                              | MWH of Non-Firm Avail./(Deficient): | 114.0 |       |                                         | Non-Firm Block 1: | 0.0   | 0.0           | 0.0 |     | Copper  | 3.0    | 67.0   | 10.0 | 1.0                                | 54.0 |     |     |
| 26 |     |       |                              | Total Cost of Non-Firm:             | 0.0   |       |                                         | Non-Firm Block 2: | 0.0   | 0.0           | 0.0 |     | 6.0     | 41.0   | 41.0   | 0.0  | 2.0                                | 0.0  |     |     |
| 27 |     |       |                              |                                     |       |       |                                         | Non-Firm Block 3: | 0.0   | 0.0           | 0.0 |     | 7.0     | 36.0   | 39.0   | 3.0  | 2.1                                | 0.0  |     |     |
| 28 |     |       |                              |                                     |       |       |                                         | Non-Firm Block 4: | 0.0   | 0.0           | 0.0 |     | 8.0     | 0.0    | 0.0    | 0.0  | 1.0                                | 0.0  |     |     |
| 29 |     |       |                              |                                     |       |       |                                         | Non-Firm Block 5: | 0.0   | 0.0           | 0.0 |     | Total   | 516.0  | 611.0  | 41.0 |                                    | 54.0 |     |     |
| 30 |     |       |                              |                                     |       |       |                                         | Total:            | 0.0   | NA            | 0.0 |     | FC      | 102.0  | 103.0  |      |                                    |      |     |     |
| 31 |     |       |                              |                                     |       |       |                                         |                   |       |               |     |     | PV      | 586.0  | 602.0  |      |                                    |      |     |     |
| 32 |     | NOTE: | * Spin = Forecast Quota   =  |                                     |       | 82.0  |                                         |                   |       |               | 0.0 |     |         | 688.0  | 705.0  |      | RR = Ramp Rates                    |      |     |     |
| 33 |     |       | ** Output comes from the EMS |                                     |       |       |                                         |                   |       |               |     |     |         |        |        |      | LG = Lost Generation because of RR |      |     |     |



min_row: 13
max_row: 33
min_col: 1
max_col: 20
target_cell_row_idx: 23
target_cell_col_idx: 10
target_cell_value: NA
formula: =+IF(I23>0,(I18*J18+I19*J19+I20*J20+I21*J21+I22*J22)/I23,"NA")