ich komme mal wieder bei der Erstellung einer Tabelle nicht weiter. Ich habe versucht, folgende Tabelle der Textbreite anzupassen, aber leider ohne Erfolg. Bekomme ständig eine Fehlermeldung, wenn ich versuche einen Zeilenumbruch zu erzeugen, sodass die Gesamtbreite schmaler wird.
%
\documentclass[a4paper,12pt]{scrartcl}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{makeidx}
\usepackage{graphicx}
\usepackage{mathptmx}
\usepackage{psfrag}
\usepackage{booktabs}
\usepackage{array}
\usepackage{geometry}
\geometry{a4paper,top=25mm,bottom=20mm,left=40mm,right=20mm,footskip=15mm,includefoot}
\begin{table}[htbp]
\centering
\caption{Add caption}
\begin{tabular}{l{3cm}l{3cm}l{3cm}}
\toprule
\multicolumn{1}{l} & \multicolumn{3}{m{3\textwidth}|} Confidence in observed changes (latter half of the 20th century) & Changes in Phenomenon & Confidence in projected changes (during the 21st century) \\
\midrule
Likely & Higher maximum temperatures and more hot days\up{1} over all land areas & Very likely \\
Very likely & Higher minimum temperatures, fewer cold days and frost days over nearly all land areas & Very likely \\
Very likely & Reduced diurnal temperature range over most land areas & Very likely \\
Likely, over many areas & Increase of heat index\up{2} over land areas & Very likely, over most areas \\
\multicolumn{1}{l} & \multicolumn{3}{m{3\textwidth}|}{Likely, over many Northern Hemisphere mid- to high latitude landareas} & \multicolumn{1}{l}{More intense precipitation events\up{3}} & Very likely, over many areas \\
\multicolumn{1}{l}{Likely, in a few areas} & \multicolumn{1}{l}{Increased summer continental drying and associated risk of drought} & Likely, over most mid-latitude continental interiors. (Lack of consistent projections in other areas) \\
Not observed in the few analyses available & Increase in tropical cyclone peak wind intensities\up{4} & Likely, over some areas \\
Insufficient data for assessment & Increase in tropical cyclone mean and peak precipitation intensities\up{4} & Likely, over some areas \\
\multicolumn{3}{r}{\up{1}Hot days refer to a day whose maximum temperaturereaches or exceeds some temperature that is considered a critical threshold for impacts on human and natural systems. Actual thresholds vary regionally, but typical values include 32$^{\circ}$C, 35$^{\circ}$C or 40$^{\circ}$C.} \\
\up{2}Heat index refers to a combination of temperature and humidity that measures effects on human comfort. & & \\
\multicolumn{3}{l}{\up{3}For other areas, there are either insufficient data or conflicting analyses.} \\
\up{4}Past and future changes in tropical cyclone location and frequency are uncertain. & & \\
\bottomrule
\end{tabular}
\label{tab:addlabel}
\end{table}%Ende des DokumentesDanke!