Chart this supplied monthly dataset in chronological order.
Unit: [actual unit]. A blank means [source meaning]; zero is a valid
observed value. Show missing periods explicitly and break the line
at unavailable observations. Do not replace blanks with zero, join
across them or interpolate unless I explicitly request a labelled model.
Explain observed values and limits without inventing missing months,
causes or a continuous trend. Include the source table and actual file/source.

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Show the prepared rows used for the chart, retaining original month,
value and missing state. Explain how blank and zero were handled.
Do not use a cleaned table that hides omitted periods or changes the
source convention. Mark a parsing assumption as a question if needed.

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The chart [connects across / replaces with zero] the missing [period].
The source says that value is unavailable. Preserve the missing state,
show the period and break the line there. Keep the observed zero and
other source values unchanged. Correct any explanation that implies
a measured value, continuous trend or cause across the gap.
Return actual revised chart/source and prepared rows for review.
