The share of an initiative's planned savings you expect to actually capture — your single best estimate. It moves the center of the forecast (the green line) up or down. 100% = full plan; 80% = you expect four-fifths of the planned savings.
The range of plausible outcomes around that estimate — how sure you are. It sets the width of the shaded band and does not move the center. ±15% means the result is likely within 15% above or below the expected case.
A single realization factor applied to all 19 initiatives at once — a quick top-line stress test before fine-tuning individual rows.
Formula: effective = base savings × forecast accuracy × realization | low / high = effective × (1 − confidence). Realization shifts the line; confidence opens a band around it.