John LeslieJ

Module 4 Tables and Figures ASM Webinar: Scientific Writing and Publishing

The “Big Picture” For other scientists to understand the significance of your data/experiments, they must be able to: • understand precisely what you did • see your data in a clear and simple way • clearly know what your data demonstrates • determine if the data you present justifies your interpretations and conclusions

Text, Table or Graph?

Tables & Figures: General Info

• Text for simple or non-significant changes

• Often looked at when the text is ignored

• Tables or graphs for essential repetitive data

• Don’t dump all of your data into a Table or Figure “just to make sure the reader sees it all”!

• Tables for precision when exact results are critical

• Good quality tables and figures can help get papers published

• Graphs when trends and tendencies are more important than exact values

• Usually not edited (other than for size and retention) prior to publication

• Present data in only one of text, table, or graph

• Experimental detail in legend often is limited

Tables - What and When

Tables - How to Prepare • Title should be as brief as possible

• Use a reasonable number of lines and/or columns

• Words usually left-justified or centered

• Use for essential repetitive data • Give only the correct number of significant digits • Comparing columns is easier than comparing rows • Insert them in the order in which they are called from the text • Must be self-explanatory

Scientific Writing

• Numbers usually right- or decimal-justified • Footnotes for explanation not experimental detail (but journal style varies) • Horizontal lines are OK, vertical lines are not, submit with only the lines used by the journal

John LeslieJ

Over-sized Tables

Figures • Visually – the most eye-catching part of the presentation, especially a color photo

• Is all the detail presented needed? • Must it all be in the same table? • Submit on multiple pages; do not reduce

• Determine figure’s purpose, then determine the form • Make sure the important points are obvious and that presentation form is not hampering communication • Color can be expensive ($400-$800/page)

Figure legends (1) • Briefly describe the data in the order presented • Make the figure understandable in isolation • Do not fully repeat the methods section

Figure Legends (3)

Figure Legends (2) • Provides enough experimental detail that a reader familiar with the topic understands how and why an experiment was done • Define all terms and abbreviations essential for understanding (lane numbers, concentrations, etc.)

Line Graphs & Charts (1) • Final product should be high resolution

• Start with a summary sentence or phrase

• Make sure that data lines & symbols are larger/bolder/more prominent than borders and labels

• Focus on the figure describing what is presented

• Readers will look at large objects first and then small ones

• Avoid conclusions and interpretations

Scientific Writing

• Objects/lines near each other usually are viewed as a group – if different make it very clear (especially if scale changes!) • Using related symbols makes interpretation easier

John LeslieJ

Line Graphs & Charts (2)

Photographs

• Combine similar images into composites wherever possible

• Check journal standards

• Labels large enough to withstand reduction (usually to one column width)

• Crop for 1:1 reproduction if possible

• Reduce empty space as much as possible

• Indicate size using a bar in the photograph

• Symbols usually defined in the legend • Legends on a page separate from the figure

• Journals expect them as electronic files usually with high dpi (300 or better)

• Must be self-explanatory

• Must be self-explanatory

Image Manipulation • Adjusting contrast (universally) usually is OK • Cropping the image for size is OK (but implies nothing important has been left out)

Finalizing Figures • All sections of your paper relate directly to your figures

• Enhancing image can be considered fraud • Be prepared to submit original (unmanipulated) image files, i.e., the raw data

• A good figure is worth 1000 words

• J Cell Biol. found that 25% of submitted images were manipulated inappropriately and had to be redone before they were acceptable

• Clear figures make the data easier to understand

• Journals check routinely for manipulation • Submission may require statement that manipulation has not occurred

• Figures support a complete, logical, and convincing story

Arranging Figures

• Chronological order may not be best • Arrange to tell the “story” logically

Scientific Writing

John LeslieJ

Design

Figure 1: Sizes of 3 cell populations and cell proliferation after TCR stimulation.

• Design each figure to make one clear point • State that point in the figure title

Layout figures appropriately Figure 2: Population A cells are larger than those of B and C.

Help the reader interpret the data

Scientific Writing

John LeslieJ

Summary

• Figures are the focal point of a paper • They should be self contained • Make it easy for the reader

Scientific Writing

Module 4 -

Module 4. The “Big Picture”. For other scientists to understand the significance of your data/experiments, they must be able to: • understand precisely what you ...

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