TOPCATis an interactive graphical viewer and editor for tabular data.Its aim is to provide most of the facilities that astronomers needfor analysis and manipulation of source catalogues and other tables,though it can be used for non-astronomical data as well.It understands a number of different astronomically important formats(including FITS, VOTable and CDF) and more formats can be added.It is especially good at interactive exploration of large(multi-million row, lots of columns) tables.
It offers a variety of ways to view and analyse tables,including a browser for the cell data themselves,viewers for information about table and column metadata,and facilities for sophisticated interactive1-, 2-, 3- and higher-dimensional visualisation, calculating statistics and joining tablesusing flexible matching algorithms.Using a powerful and extensible Java-based expression languagenew columns can be defined and row subsets selected for separate analysis.Table data and metadata can be edited and the resulting modified tablecan be written out in a wide range of output formats.
It is a stand-alone application which works quite happilywith no network connection.However, because it uses Virtual Observatory (VO) standards,it can cooperate smoothly with other tools, services and datasets in the VO world and beyond.
The program is written in pure Java and available under theGNU General Public Licence,though some of the library code is LGPL.It has been developed mostly in the UK within various UK and Euro-VOprojects (Starlink, AstroGrid, VOTech, AIDA, GAVO, GENIUS, DPAC) and underPPARC and STFC grants.Its underlying table processing facilities are provided by the relatedpackagesSTIL andSTILTS.
You can see screenshots of TOPCAT in action in the following places:SUN/253's windows appendix details all of TOPCAT's windows with illustrations[somewhat outdated] The TOPCAT gallery is a page containing lots of window screenshots[somewhat outdated] The TOPCAT V4 graphics page showcases some features of the new-style plotting windows introduced in version 4 (March 2013)[very outdated] The TOPCAT V3 screenshots page showcases some of the features introduced at version 3 (August 2007)There's a montage of some of the windows TOPCAT provides below; click on it for a full size version
TOPCAT is written in the Java language using theJava 2 Standard Edition version 8,and should run on any Java SE 8 or more recent system.This means it can be run on a wide range of platforms, without requiringany recompilation - you just need to ensure that you have asuitable Java Runtime Environment (JRE) - though that's not necessaryfor the MacOS DMG download, see below.If you don't have Java installed, or have an unsuitable version, you can obtain the Java SE for Linux, Mac OS X, MS Windows and Solaris fromOracle's web site(you only need the "JRE" rather than the "JDK" download,unless you will be doing development work).Java SE Runtime Enviroments (sometimes called JVMs or Java Virtual Machines)for other platforms may be available from operating system vendors.OpenJDK is also suitable.
If starting TOPCAT fails with an error likejava.lang.UnsupportedClassVersionError,you have a version of Java that is too old, and you shouldupgrade to Java 8 or later.If you're unable or unwilling to do that and you only have therather ancient Java 6, you can still use TOPCAT versionv4.6-3 or older.
Having got Java, There are several ways to download TOPCAT, described in rough order of advisability in the following subsections.More information on how to run the program having obtained itcan be found in SUN/253's section on Invoking TOPCAT.
On Unix-like operating systems, download one or other of thesejar files and the startup script topcat into the same directory, then "chmod +x topcat", and you can just run the command: topcatOn non-Unix systems the script won't work, and you can use a command like: java -jar topcat-*.jaror invoke it in some other system-dependent way such as by clicking on it.
Even topcat-full lacks a few of the niche features (proper coordinate handling in SoG, NDF viewing in hierarchy view,parquet support),since these require native libraries; for these you will need theFull Starjava installation described below,or topcat-extra if you just want parquet.
The application DMG file contains a bundled Java Runtime Environment, user manuals for TOPCAT and STILTS, and the topcat-extra.jar file (see above). The FAQ contains advice on how to set flags for memory usage etc. It ought to work for both Intel and Apple Silicon hardware, and does not require an external Java installation. It is therefore quite large; if you want something more compact, you can use an existing java installation with one of the topcat-*.jar Standalone Jar Files listed in the previous section. The main disadvantage is that you don't get to click on a yellow cat to start it.
Note:the WebStart version of TOPCAT is being provisionallydeprecated from TOPCAT v4.8-8.The jar file is no longer signed, which means various things may not work,see the FAQ.WebStart is therefore no longer recommended.But if you really want, you can try it attopcat-full.jnlp ortopcat-lite.jnlp.
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If you opt to send Google data about the usage and performance of your Chromebook, Google gets diagnostic and usage data about your app activity. Google also receives crash reports. Any crash reports Chrome sends to Google may also include some sensitive information about your Android apps.
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Search for a mod to install. It is possible to filter for a specific category, and also view some statistics such as Ratings and DatesCheck the date on the mods! Old mods could be outdated and/or broken, and cause issues if enabled!
To download a mod click the Subscribe button on its page. Once downloaded the mod will be automatically activated and ready to use.Subscribing to a mod allows you to receive automatic updates when the author of the mod makes changes.
Inside the Edit Instance menu, select the version tab on the left sidebar. From here, you will need to decide on which mod loader you would like to use. Fabric and Forge are the most popular, with Forge having the most mods available. Fabric and Forge mods are generally not cross-compatible, so choosing between them will change your selection of mods.
Once you have picked out your ideal mod loader, go to the Mods tab, and select the Download Mods option that's to the right. From here, you can choose to install from both Modrinth and CurseForge services. Modrinth focuses more towards free and open-source mods, however, CurseForge has a much larger selection.
After you've chosen your mod provider, you can search or browse for any desired mods. Click the Select mod for download button to add each mod to your download queue. Once finished, you can now press OK, and your mods should begin downloading.
If you have elected to use the Fabric mod loader, then please ensure that the latest version of the Fabric API mod available for your game version is installed. It is mostly required for Fabric mods.
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