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laboratory directors—See "associate directors, NCAR."

Lagrangian—initial cap. Measures parcels of air as they move around, like a drifting buoy. See also: "Eulerian."

latitude—in nontechnical writing, spell out "degrees" and lowercase the compass point: 30 degrees north. In technical writing: use the degree symbol closed up, and abbreviate the compass point: 30°N. See also: "degrees." AP usage examples: New York City lies at 40 degrees 45 minutes north latitude and 74 degrees 0 minutes west longitudeNew York City lies south of the 41st parallel north and along the 74th meridian west.

least-squares (adj.)

lee-wave (adj.)

library—NCAR Library (the department), Mesa Lab library, Foothills library (branch locations)

lidar—Treat as a word, not as an acronym, but include a brief explanation: "a laser radar." Originally stood for light detection and ranging.

-like—for compounds ending in "like," spell closed up (childlike) except when the base word is a proper name (Arctic-like) or would triple the letter l (bill-like). AP makes one exception: flu-like.

Linux—initial cap (computer operating system) But note UNIX is all caps.

lists, numbered or lettered

  1. Do not use parens around the identifying numbers or letters when the material consists of full sentences or paragraphs. The number, followed by a period and one space (only) should be at the normal margin or  indent level. The paragraph will look like this.
  2. When numbered or lettered items are run in with the text, the designators should be within a pair of parens, (a) to help the reader pick out the points and (b) to avoid possible confusion between the article "a" and the letter. For the same reason, it may be preferable to use numbered items, unless (as in this paragraph) the paragraph is already numbered. If there are a great many numbered/lettered items, or a few lengthy and clause-ridden ones, it's more readable to break them out as paragraphs rather than run them in with the text.

See also "Bullets."

locations—national laboratories and state government locations are followed by both the city and state when this information is relevant. If either is already in the title, it should not be repeated. Jet Propulsion Laboratory, Pasadena, California; Illinois Water Survey, Springfield; Woods Hole Oceanographic Institution, Massachusetts. Give locations for NASA centers and for NOAA labs, if known.

logos—See the downloadable files and design standards for using NCAR and UCAR logos in print and online.

longitude—in nontechnical writing, spell out "degrees" and lowercase the compass point: 30 degrees west. In technical writing: use the degree symbol closed up, and abbreviate the compass point: 30°W. Find AP usage examples at "latitude," above. See also "degrees."

Loran—Long Range Aid to Navigation—an acronym, but initial cap only

Lyman-alpha—(scientific symbol lacks consistency: Lα, Ly-α, Lyman-α) spell out both words on first use; use L-alpha thereafter, as appropriate.

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