UCSFViewer

Spectra

Open .ucsf Open .json

Align viewing mode

Vertical

Horizontal

Stack

Vertical stacks panes in a column and locks the X range together; Horizontal places them side by side and locks Y; Stack overlays every spectrum in one pane. Click a pane to focus it — the controls below act on the focused pane.

Mouse

Zoom

Pick peak

Select

Crosshair on hover Symmetric crosshair (mirror across diagonal) Show F1 = F2 diagonal

Drag a box to zoom in. Wheel over the X or Y axis zooms that axis only.

Overlay axes

X axis (F2 — horizontal)

Nucleus

Y axis (F1 — vertical)

Nucleus

Statistics (semi-transparent)

Use σ rings (d₁, d₂) — uncheck to plot the raw histogram bins

X level90%

Y level90%

Every bin of the uploaded histogram is drawn as its own pixel box, shaded by density. The level is a horizontal cut through each atom's distribution, normalized to its own maximum — like a contour level. Raise for a tight core, lower to include the tails.

Label atoms (top-right inside ring)

Reference offset (shifts statistics only)

X offset0.0

Y offset0.0

Residues

Select all residues

Hover to preview one residue. Click to pin (multi-select); others dim but stay clickable.

Sequence (FASTA)

Open .txt / .fasta

First residue # number of the first letter

No sequence loaded. Residue numbering falls back to manual entry.