The header and step-2 columns clarify this. For batch 49's step 2 the sheet holds only Epomine SP-018, 30, 0.2, 80 — the "0.2" sits in the Time (h) column and "80" in the Temp °C column, and the "Vac / N2" (atmosphere) column for step 2 is empty.

Step 2, batch 49 (S 9076 #49):

• Duration: 0.2 (the record's time_h; copied verbatim from the Time (h) column) = 0.2 h, i.e. 12 minutes.
• Atmosphere: not recorded. The structured record has no atmosphere value for step 2, and the source sheet's "Vac / N2" cell for batch 49 step 2 is empty — so no atmosphere (N2 / vacuum / air) is stated in this data.
• For context, the step 2 row also lists temp = 80 (Temp °C column) and reactant i) Epomine SP- 018, qty 30 g. The extractor flagged the Temp/Time layout as an interpretation (confidence medium).

So: time is on record (0.2 h); the atmosphere is a genuine gap — the sheet simply leaves that cell blank for this batch. I would not infer N2 from the neighbouring batches (e.g. 30, 33) which do carry "N2" — that is not evidence for batch 49.