You could create a helper column "Seconds" and plot that as your x-axis instead of "Time".
tmp.xlsm |
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| A | B | C |
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145 | Time | Seconds | Data |
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146 | 0:00:02 | 2 | 1 |
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147 | 0:00:04 | 4 | 3 |
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148 | 0:00:06 | 6 | 5 |
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149 | 0:00:08 | 8 | 3 |
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150 | 0:00:10 | 10 | 5 |
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151 | 0:00:12 | 12 | 4 |
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152 | 0:00:14 | 14 | 2 |
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153 | 0:00:16 | 16 | 3 |
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154 | 0:00:18 | 18 | 4 |
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155 | 0:00:20 | 20 | 1 |
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156 | 0:00:22 | 22 | 1 |
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